Hi Craig -
Yep I'm from the UK and I'm doing it in 2017 too. But my permit date is May 10. I'm going to do a section further up the trail first from about April 20, maybe Belden to Castella (need to figure out the snow), so I don't run short of time getting to the finish.
About resupply - I'm a veteran. I did the trail in 2015 and learned a lot about how to manage that stuff - main thing is don't over plan it. Your plan will be ruined within days anyway, so let it unfold naturally - and don't be worried. If you DM me, I can go into greater detail, but there's a million tracks you pick up very quick. For example, if you are lucky enough to not be too constrained by money, I found a brilliant resupply option called Amazon.com. They can deliver freeze dried food to the moon if you wanted. They got me out of a hole a few times.
But, anyway, DM me and I'll see if I can help.