You must be gutted that you cannot run - I had to defer last year as |I was injured, so I know how you feel.
If it's any consolation I feel much more 'ready' than I did last year, although my target is purely to get round.
Good Luck for nrxt year.
Charity runners at London will raise MILLIONS of pounds this year for a whole host of good causes.
I will be one of those running for a Charity and I aim to raise several thousand pounds for people with incurable illnesses. (and yes I have trained, and hope to finish in between 4 - 4.12 hours...