Welcome Karen to the thread. As you can see lots of support on here especially from others of a similar endurance background. My advice would be a weekly speed/track session. I found this to be a good benefit plus the longer runs with marathon paced miles. I do agree too that getting some of your shorter race times down will help the marathon time too.
Well done on your 10 mile PB time Sal. I'm seriously thinking of doing the Amsrterdam marathon next October. We were out there for a week as it was half term and really enjoyed it, so back next year - it would be rude not to run it next year!
Getting a bit more enthusiastic now just reading about everyones plans for Spring marathons. I'm looking forward to starting training again.
I'm actually from Crewe Minni and the Cumberland track where they hold the track marathon was my home track - so many memories, although strangely I used to do Long Jump & sprinting back then in my late teens. The thing that puts me off a track mara is that you'd be running half of the distance round a bend!