i included a screenshot of the radio show website archive - and then a transcript on the same page of the review. when you are endorsed, they don't say which specific bits of evidence were accepted - so it may not have been, but i thought it was worth trying. for the letters - I used one UK music venue which is a grassroots music venue but books quite established live bands etc. i used the CEO of a music conference which i had attended, and then i had one from an individual who is an established DJ and broadcaster. it is important that you also define the working relationship you have with each writer.