Chick that's really bad news, so sorry to hear about that. Your post crossed with my last one.
Only you can judge about whether you can take another batch of marathon training, but I think you underestimate how young you are! I hadn't even started running until I was several years older than you.
Reg, Tommo, Shaz, thanks for the great reports all. Shaz it must feel great to be back after such a collection of injuries.
The cutoff for Green start was 3:15 in 2014 and 2015, or so I was told. Must have been a big change for 2016. I've never been to the other starts, and hope to be back at Green next year so probably never will, I can only imagine how busy they must be.
In case I haven't mentioned it before, Brighton is far less crowded! I haven't yet entered as I'm not confident enough that I'll be able to pack in the long cold training runs. Following my recent lymphadenectomy I've been given a 104-page booklet "Understanding lymphoedema" which is something I might get in my right arm as all the lymph nodes are gone from my right shoulder. I should be able to start running 4 week afer the operation, but the risk of lymphoedema basically continues for the rest of my life. The long booklet seems to suggest running is fine, but in another place says one shouldn't get too hot or cold. From my experience getting too cold on long marathon training runs is quite common.
Thus my current plan is to look for an Autumn marathon and see how training for that works. Thus if anyone is still reading(!), I'd be interested in suggestions for October 2016 marathons which I can get to on the day from West Kent. Thanet, which is the obvious one is in early September, which will probably be too early even if all goes well.
Westy - Don't be too hard on yourself. A great report and a fantastic time, maybe not a PB, but these do get harder, especially at your pace! Also, even at your your relatively youthful age, it does get harder even to keep to the standard, so don't be too down. I do agree about even or negative splits. I find these are so much more enjoyable during and after the race, even if they mean getting a slower time.
I also wonder about all this thought about choice of shoes. I wonder if it's worth it. I've never thought seriously about changing shoe type for a race.
Well done all who raced London. I was following all (I think) threadsters whose number I could easily find. My impression is that most lasted really well, especially compared to colleagues and friends from my local running club who I was also following. I'll try to summarise the data in a few days. I think it speaks well for the the quality of the P&D training.
If I'm able to run another marathon I'll probably try to follow the book!