DS - ouch. 
Mr Puffy - so what was missing this year? What are you going to change for the next marathon? I guess sub 3:30 is still your target. If you've run 3:33 previously then you know you've got it in you with the correct training. Which half are you doing? I'd say February is too early to set your marathon time - there's still lots you can do from there. Which marathon are you doing?
Hilly - that is a big mileage. What kind of speed session will you do when you start. I sympathise with your calf trouble - its my weak area too. I'm much better at recognising it now and pulling back.
Taper - I used to always do a 2 week taper because I used to race a 14m three weeks out. I'm not sure when I slipped into the 3 week. I did a 22m thirteen days before a marathon once and it didn't do me any harm.
BR - I'm really interested in your depletion approach. Do you accurately measure everything as per your body weight etc?
Carl - most people are guilty of not doing a long enough warm up but try it and I bet it helps.
Sarah - hope you have a great parkrun tomorrow! 
hilly - I'm meeting Sarah at Newcastle parkrun. I think she might beat me. 