It's also worth looking at more than one 50K training plan, so you can see how they vary - indicates that the training is not set in stone.
For example the Ultraladies training plan at http://www.trailrunevents.com/ul/schedule-50k.asp assumes you are starting a 20-week progrmme able to run a 16-mile LSR followed by six miles the next day; peaks at 26 miles followed by 10 miles at both six weeks out and four weeks out, with an easier week in between; and only gives mileage, no hill repeats or anything, while this one http://www.runforthetoad.com/trainingprogram.html starts with the 'long' runs at 14km (less than 9 miles) followed by 5 km; tops out at 38 km (a little under 24 miles) without a semi-long run the next day; and has some speed repeats, tempo and hill sessions included in the middle of the plan.
"Much more important would be a foil blanket, head torch with enough batteries, map (and ability to use it) and a mobile phone, plus some cash...........as well as enough food/ water and clothes to survive if you sprain your ankle and have to wait in the middle of nowhere for a couple of hours waiting to be evacuated."
Absolutely! And the number of people who complain at the idea that they ought to carry basic survival stuff like clothes to avoid hypothermia is staggering.
Mr Zuvai, that's good running. Great pace on the parkrun.
I decided to head out yesterday and hope to do 10 miles but cut back if necessary. Ended up on 10.12 in 1hr 33, so average 9:11/mile. Lovely sunny weather (if cold) predicted for this morning, and the club run was after all going to use the off-road routes (since frozen, not ankle-deep mud), so I thought I'd run to the club, go off on the run and I could always take the 90-mins option. Groin muscle twinged occasionally but always settled if I slowed down. Finished on 23 miles in 3:54, so about 10:10/mile overall - a little slower than I would have preferred but not too bad. Tomorrow will definitely be a rest day (except for cycling to work and back over Crystal Palace Hill...).
Still not sure whether to do the tour this time or not. If I do it then definitely the Friday - Saturday is for parkrunning (gently of course) then resting.
Hoping that my hip flexors are recovered from last weekend - two XC races, five miles then 6 miles, really took their toll. Not sure whether to go for shorter back-to-back runs or a proper 20+ mile long run this weekend. Only five weeks to my marathon and I know I'll feel better about that if I've reached at least 24 miles previously, as I've not run that far for a while.