Hi hope someone can help?
I've just found out that I can claim some work expenses using the P87 form. I've also heard that I can backdate claims for 5 years. My first question is: Do I need to fill in a separate P87 for every previous tax year that I want to claim for or does it all go on the same form?
Also...having had a look at the P87 it seems like I need to put down any payment that I have received already towards my expenses. I don't receive any payment directly from my employer but I have managed to get some of my travel costs paid through grant funding (I'm an academic). So my second question is: Do I include any grant funding I've received?
Thank you! 
