5 Live Investigates

Thousands of homeowners 'mis-sold' cavity wall insulation, say campaigners. The insulation was fitted as part of a drive to boost energy efficiency in Britain's homes. Also - the poor safety record in some waste and recycling plants. One worker describes how his arm was severed after he became caught in a machine where the protective guard had been removed.

The elderly care homes failing to meet national standards. One in five care homes for older people in England fails to meet CQC tests.

Parents owed child maintenance payments via the CSA are owed almost £4 billion, but questions are being asked about how much of it will ever be paid.

And, concern over the websites that encourage suicide. Is there a link between the internet and self-harm?

Patients group Healthwatch estimates 1 in 8 mental health patients in England are sent home from hospital too soon or without adequate support. Also - have some of the telecoms companies been hacked? We investigate after customers of O2 received phishing emails asking for their bank details. And the latest in our investigation into the latest fad to hit the beauty and wellness industry - the vitamin intravenous drip!

8 out of 10 ambulance trusts in England are failing to hit performance targets for responding to the most serious medical emergencies. With NHS emergency services in crisis, the programme goes inside one ambulance trust as they cope with a sharp rise in calls. The programme sees how they manage life and death decisions and the impacts of queues outside A+E units which can take an emergency vehicle off the road for hours.

Latest figures show passenger complaints about rail travel are on the rise. Maintenance of tracks and key infrastructure is behind schedule leading to delays and cancellations. The programme assesses performance of the network and speaks to people affected when it goes wrong.

With 31 pubs closing each week, how successful is the government scheme designed to protect them from developers? For the past two years, campaigners have been able to designate a pub as an Asset of Community Value, requiring owners to consider offers from local residents if they put the business up for sale.

Also, the delay in banning lethal 'legal highs'. David Cameron said almost a year ago that the Home Office had powers to ban deadly drugs in days. But one substance - AMT - can still be bought legally.

5 live investigates reveals one in seven people arrested in England and Wales last year came from overseas and many police forces often fail to carry out basic background check to see if they have committed offences abroad. And are women being given enough advice about the dangers of drinking while pregnant? We hear from one mother who drank heavily and gave birth to a child with learning and developmental problems

Royal Mail says its traditional job of delivering letters and parcels six days a week to every address in the UK for the same price is under threat. We hear from frontline postmen who fear for their jobs and claim rival postal businesses have an unfair advantage. But business analysts say the Royal Mail needs to be more efficient. And why are cancer patients being denied a radiotherapy treatment which leading doctors say is cheaper and more effective?

A patient describes how he got cancer from a kidney donated from a woman with lymphoma. 1 in 4 transplant organs now comes from a "higher risk" donor - people who were over 70, had a tumour or a history of drug abuse. One doctor says transplant units feel under pressure to use organs that are less than ideal. Also, is enough being done to lever up GCSE standards in poor-performing independent Muslim schools?