Thanks for all your comments guys 
I've just been looking at pics from Sunday and you can tell when I suddenly knew sub 3.15 was possible! First time I have done a marathon without a pace band of any kind and my Garmin wasn't tallying up with mile markers, so I really had no idea how close I was till the final stages. Thankfully being laps I knew where the finish line was.
Ant well done indeed at St Neots! It's on my list of HMs to do.
Bro very best of luck at the weekend!
You have plenty of 'hope' Minni .....for one thing you are much younger than me...
Best wishes to you and others with the lurgy or struggling with injuries 
Not sure whereabouts I will be on Sunday. I may cycle to one of the villages or may stick around the showground. Will see what the weather is like.