I'm seriously impressed with all these Loch Ness people- i find it hard enough to do the hills in London near me (not many)!
I second Nells post marathon recovery plan. In past years i have just stopped doing any running and just concentrated on cross training and then found i got injured quite quickly when i started back. This year ive focussed on keeping up a level of running straight after my marathons and I'm turning it up now, so far so good. Hope this helps.