Petrol is something millions of drivers around the UK rely on, but when faced with the choice of what to fill up with at the pumps, many wonder what is the difference between regular and premium unleaded?

That’s exactly what listener Irfan wanted to know, and if premium can really deliver on its promises to make your car more efficient, take you further, and clean out your engine for a higher price tag.

Greg Foot drives the investigation into unleaded petrol, what’s changed since we moved from E5 to E10 as our standard, what makes premium special, can it take you further, and whether our carbon footprint is better with one than the other?

PRESENTER: Greg Foot

Sales of energy drinks are rising and their brightly coloured cans line the shelves of almost every supermarket or grocery store in the UK. But do brands like Monster, Red Bull and Relentless deliver on their promises?

Listener Syed is a consultant radiologist and says he needs to be on his A-Game in his demanding job. He wants to know if an energy drink would be any better than his usual cup of coffee in helping him stay alert. He's also keen to know more about some of the ingredients they contain - things like taurine, guarana and electrolytes. What exactly do they do? And are energy drinks safe to drink regularly?

Presenter Greg Foot has a thirst for knowledge and speaks to expert dieticians and cardiologists to find out if energy drinks live up to the hype. Are they the best thing since sliced bread - or marketing BS?

PRESENTER: Greg Foot

Shampoo ranges hugely in price, from own brand bottles to premium products that promise to improve your hair, leaving it in better condition, stronger and shinier. But can they really deliver?

Listener Sophie sent in a WhatsApp to ask just that, as well as whether we should use different shampoos depending on our hair type, if sulphates or parabens could be harmful to our hair, and if shampoo bars can do the job just as well, and be a greener option?

Greg Foot untangles some of the most common claims by speaking with a clinical Trichologist (someone who has studied the structure, function and diseases of human hair) as well as an expert chemist and pharmaceutical analyst.

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

Two products dominate the market for nasal sprays that claim to reduce symptons of a cold - Vicks ‘First Defence’ and Boots ‘Dual Defence’. But do they work?

Listener Leah got in touch because she catches lots of colds from her young son and wants to know if they can help her get over them more quickly. She also wants to know if they’re safe to use regularly and how long you should take them for.

Presenter Greg Foot sniffs out the evidence and talks to a leading expert who’s dedicated most of his career to investigating cold remedies.

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

In the run up to Christmas, many parents will be checking on their battery supplies ahead of Santa bringing gifts that require them. But do branded batteries, that promise more power and longer life at a higher price point, really deliver it?

Listener Peter got in touch asking just that, as well as whether batteries have an expiry date?

Greg Foot recruits some year 7 pupils and their teacher to help him perform a test to find out, and speaks to one of the country’s leading scientists about what gives a battery more power, or helps it store more energy.

You can also hear more about the difference between single use, and rechargeable batteries in our longer podcast episode on BBC Sounds.

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

Smelling good can come with a hefty price tag with the price of perfumes often getting into the hundreds of pounds. But what if there was a cheaper alternative?

Listener Callum got in touch because his bottle of expensive perfume is about to run out. Presenter Greg Foot turns his nose to the task, testing so-called 'clone' perfumes which claim to get as close the originals as to be indistinguishable - but for a fraction of the cost. Speaking to an expert perfumer he finds out exactly how the clone houses copy the ingredients of designer perfumes and whether they last as long.

Do they pass the sniff test? Are they the best thing since sliced bread or just marketing BS?

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

It’s something most of us will have used at some point, and a product that has been around for decades in various forms. But do all the advertised fancy features, pivoting heads, multiple blades and higher price tags, really make a difference to your shave?

Listener Tim got in touch, asking just that, as well as whether all the extras on razors these days also have an impact on the environment?

Greg Foot focuses on modern cartridge razors in this episode, and cuts through the marketing hype to get answers, by speaking to a leading Dermatologist, as well as one of the top scientists at one of the largest razor manufacturers, Gillette.

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

It’s one of the most talked-about cosmetic products but what’s the evidence that collagen supplements really do slow the visible signs of the ageing process?

Listener Jo got in touch wanting to know if the collagen supplement she’s spending £53 per month on will live up to its claim of reducing wrinkles, while promoting “glossy hair and plump dewy skin.”

Other listeners asked whether it can help with joint aches and pains, or strengthen nails?

Greg Foot sets out to answer all these questions by speaking to a leading consultant dermatologist as well as the co-founders of two of the biggest companies selling collagen supplements, Absolute Collagen and Ingenious Beauty.

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

With shorter days, longer nights, and bad weather leading to the winter blues for many, and for some the more severe Seasonal Affective Disorder, Sliced Bread investigates whether specially designed lights can really help improve how we feel.

Listener Ross got in touch on WhatsApp after he’d read claims Wake Up Lights and SAD Lamps can boost our mood, and wanted to know what “medically certified” means when accredited to them, and if it’s worth paying extra for it?

Greg Foot finds out by speaking to a leading expert in light therapy, as well as by visiting a manufacturer of these lights, to ask them to explain their claims, and whether they’re medically recognised in the UK.

This series, we’re testing and investigating your suggested wonder products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: Greg Foot

It's getting colder and with the cost of living rising, how best to heat our homes in the most efficient way possible has become a big question.

Listener Ken got in touch about a new kind of portable ceramic heater he's seen advertised, promising to heat your room using 30% less energy.

Greg Foot teams up with Octopus Energy to run it through the evidence mill and test it against three other types of portable heater: a convection heater, a fan heater and an oil-filled radiator to find out which gives the most heat for the lowest energy used. The aim is to find out which portable heater is best for heating you, and the room you're in. And how does all that compare to using gas central heating?

This series, we’re testing and investigating your suggested wonder-products. If you’ve seen an ad, trend or fad and wonder if there’s any evidence to back up a claim, drop us an email to [email protected] or you can send us a voice note to our new WhatsApp number: 07543 306807.

PRESENTER: GREG FOOT