I consider myself a fairly good both trail and general runner. I have run a trail half in 1:15, can do a flat 10km in 33:00. I recently did a vertical km in 44:57 and also did the uphill Snowdon race in 50:00 this year.

However, I have never run a marathon and I've entered a trail marathon in a month's time with 2400m of climb. I might be crazy, but I think I can do it, I plan to do some long runs, hopefully one or two 20 milers as well as as many hills as I can find. I'll be in the Pyrenees, the week before so will try and get some hills in then, although I'm aware people normally taper for a marathon. Does anyone have any advice or tips for specific things that I should do to prepare or training I should try and do?