Morning...
P&D looks good- I'm not sure I'm quite at the advanced level yet.... this will be my 3rd marathon (could have been 4th if NYC hadn't been cancelled -grrr) and I don't think I've ever got in a training week above 40 miles, let alone 55. I would love to run that much, but I think there is need for some serious lifestyle changes to give me the time.... When I was at university I was a rower and trained something like 20 hours a week- I loved this- wish I could do it now! Might download it on kindle for some inspiration...
3 miles easy this morning was good,, though I wish the sun would rise earlier. Its quite disheartening that 3 out of 5 runs in the week are in pitch black 
Which gym are you joining? I had the problem that there isn't a good one thats both in Colchester and London - I would like to be able to do my easy runs at lunchtime- but gyms are so expensive in London the only one I would choose is LA fitness, and of course that is absolutely packed at lunchtimes, so no good.
So, do we have any race plans beyond Halstead? I'm wondering whether to try for an Autumn marathon as well, or focus on Halves - in which case, I can't decide between Royal Parks (my all time favourite race), Ealing, Bournemouth, and I think I'm going to do the Bacchus full or half anyway, since it wouldn't be all out running..