Thanks EG & Sweder. I'll try out the jelly babies on the next long run, and see how I get on with the fumbling. 10 per hour is roughly 2 per mile. Gels are of course a bigger dose than JBs, but not as tasty.
Re pacing, I have already consulted the Bible (that is, the
Holy Word of Hal). He also advocates even pace. (Why he needed a
computer specialist to develop the pace charts, I'm not sure - although of course Hal dates back to the age of steam.) But I checked in my hard copy of his book recently (the King James, one might say) and he added a remark to the pace section, that slowbies (in which he definitely includes 4-hour runners) might struggle to keep an even pace, and could consider a gradual slowdown.
My 2005 pace went like this (I already have it on a spreadsheet, of course :o):
6.2: 00:08:13
12.4: 00:08:19
13.1: 00:08:13
18.6: 00:08:41
24.9: 00:09:50
26.2: 00:09:27
Just a classic case of "start too fast"?
PS - Sweder, in the above 2nd link, I like the expression "certified Clydesdale" - reminds me of your previous reference to dray horses.