3 hours 37 minutes is still a fantastic effort Henry. Although I realise that probably means very little if you're chasing that kind of PB!

I would really love to crack 4 hours in York, but I've no idea whether it's really feasible or not. Apparently the required pace for that is 9:09/mile. I ran my best Half in training a few weeks ago at 8:40/mile. Which, in theory, allows for a little bit of leeway. I suppose it all hinges on how the final third or so goes. Let's say I even manage to keep that pace up for 18-20 miles, I might be completely spent and slogging it out at 11/12 minutes a mile on on the home stretch.

Obviously just finishing is the priority. I suppose the beauty of the first time marathon is that it will be a PB regardless.