Back in 2015 in the run up to PBP, the A&S was my first 400 ever; and back then, I found it amazingly hard. That was probably down to a combination of a few mistakes, including going too fast in the first 100 to 150 km and riding on a different bike as I thought my Audax bike had an issue, and not having a proper dinner at Wells, where I had a supermarket snack instead.
My plan was to have hot food at the pub between Wells and Barton Mills, but when I rocked up there, the kitchen was already closed. I treated myself to a half pint and some crisps instead.
I was still going strong until after Barton Mills , where I basically blew up and was hit by the dozies big time. The problem was that it was too cold to sleep (ride was a few weeks earlier in the year, and it was only 4 or 5 degrees at night). The last 70 or so km between Barton Mills to Saffron Walden and Manningtree took just forever. I was so tired that for the first and only time on a ride, I had hallucinations. One lesson learned is to carry some basic lightweight sleeping kit on those really long rides.
My advice would be: pace yourself properly at the beginning, don't waste too much time during the day off the bike, eat properly in Wells and stock some food for the night stage, and eat again at the 24 hours McD in Barton Mills (which did not exist 2 years ago).
I'll be riding again this year, and am curious how things will compare to my 2015 experience.