'm going to hang on to the 24hr dream for now... I have real trouble with pace calculations when I get tired...
I've not done this race but the estimated 24 hours times for SDW were excellent IMO. I thought they looked a little quick early doors but once you slow down you slow down, and if you're not well ahead of an even pace you're not going to make it.
Perhaps take a bit of paper with est 24 hr time for each aid station as use that as a guide for where you are. At least you'll know whether you're still in with a shot or if it's gone, and once it's gone you can concentrate on doing what you need to to get round.
Aside: I'll be helping out at the 67m aid station (Whitchurch) so do say hello!
I've done 2 Beyond Marathon events and would say the food at aid stations is variable, not consistently high like Centurion. Most stuff is from the Asda value range, but there will almost certainly be a hot food one with extra bits and some homemade stuff here & there.
If there is something particular you want then I would pack it in your drop bag or carry it. Also, avoid the jelly beans, they look nice but are the chewiest things ever and a handful of them will take you 5 mins to get through!
I carry micropore tape with me on ultras. Have never had problems in training runs but felt hot spots forming in 2/3 of my long ultras, both times early enough on that I needed to stop and do something about it and both times I'm glad I did.
5 mins to stop and sort yourself out is nothing compared to letting a blister form and suffering for another x hours.