Vassos and Louise are joined by author Debra Bourne who wrote "parkrun: much more than just a run in the park". Debra tells us what she learned from writing the book, how it came about and also shares her own parkrun journey.

Professor Steve Haake is Vassos and Louise's special guest this week. He's been commissioned by parkrun to conduct a survey to understand precisely how parkrun is impacting the health and wellbeing of people and communities, what they are doing well, and what they can do better. Vassos misses parkrun because he went to the wrong station and Louise admits she's wrong.

parkrun CEO Nick Pearson is Vassos and Louise's special guest this week. He tells us all about the controversy surrounding their partnership with The Happy Egg Company, whether they have any regrets about how they handled it and he explains what parkrun's ethics are. Vassos contemplates going to parkrun in Delaware and Louise sits on the fence.

This week Vassos and Louise tackle the sensitive subject of parkrun's partnership with The Happy Egg Company. Clapham Common Run Director Jen Woolgar is our special guest. She tells us about the hurdles they overcame to get the parkrun off the ground, how they are dealing with its increasing popularity and why some of the core team wear matching hats! And Louise takes particular pleasure reading out listeners boasts of beating Vassos' "Triple Freedom".

Producer Patrick vents his frustrations after turning up at a cancelled parkrun. Vassos reckons he holds a parkrun record and this week’s special guest is one of the UK’s top ultra runners. Cat Simpson joins us on the sofa this week to discuss her journey form marathon widow to becoming a GB athlete, how she uses parkrun as part of her training and the inspiration behind setting up WMN Run.

This week's special guest is Tricia Cue who recently joined the exclusive 500 club. Tricia, whose home parkrun is Banstead Woods, tells us all about the early days of parkrun, how she celebrated reaching the milestone and how she became an accidental tourist. Vassos takes issue with a listener's email and we receive the best top tip ever.

Louise and Vassos are left to their own devices this week as producer Patrick is away once again. We hear the second part of the interview with British Paralympian Noel Thatcher who tells us all about introducing parkrun to Japan. Louise answers listeners questions and Vassos has some love for Bognor Regis.

Noel Thatcher MBE, the 5-time Paralympic gold medallist is Vassos and Louise’s special guest this week. The visually impaired runner tells us how smoking a cigarette at school led to a career in athletics, why his journey to the top was anything but easy and why being a mentor to young runners is so important to him. We also show some love for parkrun pacers and Louise tells us the cunning reason why she has not yet done Clapham Common parkrun, despite being so local to her.

History was made at the weekend as producer Patrick finally made it to his first parkrun. He tells Vassos and Louise all about it, but it was his girlfriend Kate, also doing her first parkrun that had the truly inspirational tale. Diagnosed with ovarian cancer in July, she completed the 5K just 5 weeks after surgery to remove the tumour. Meanwhile Vassos claims to have the greatest parkrun stat in history, and Louise considers wearing a wire at parkrun.

Joining Louise and Vassos this week is Dr Rangan Chatterjee, best known for his TV show Doctor in the House and resident doctor on BBC One's Breakfast Show. He tells us why he loves parkrun and why he prescribes it to his patients. Louise gets a few things off her chest and Vassos preps producer Patrick ahead of his first parkrun.