I found out from a GP the other day that Northumbria apparently has the best Mental Health resources online. I had a look and he's right. These resources are amazing and are available in all formats (written, hardcopy if you pay, audio, video).
Click on the link to see more: ntw.nhs.uk/pic/selfhelp/
Also, in the top right-hand corner where it says 'more options', there are audio guides for relaxation techniques.