Cakesy, you'll find a whole range of training strategies and mileage on here. CW and I have had similar times over the last few years, we're similar ages, he does lots of 26+ mile runs in training and this year had a few 100+ mile weeks, I could count the number of 50+ weeks on one hand but back it up with other stuff. Horses for courses.
You obviously run very well off low mileage, more miles will get you some decent gains but if you get to the point of not enjoying it then there's no real reason to add more for the sake of it - it's a hobby after all!
Louisev - there's a good chance that you'll be back better than before - sometimes an enforced break is just what you need. I'd go with OS - get the half done to qualify (which should be straightforward after a 65 minute 10) and then focus on the marathon.