Many thanks for your responses. I suspect I will feel fresher after the HIM than after marathon! The second marathon I am planning is Abingdon which I am already looking at as a faster attempt given the spring marathon will be my first.
What I am struggling to work out now is the scheduling of everything because I would ideally like to try a higher mileage training schedule for Abingdon than the one I am currently using. That means I need to ensure my running mileage stays high. How would I do that but still incorporate the swim and cycle training I will be trying to fit into my schedule? I have looked at various ways of swapping cycling for recovery runs and fitting in swimming on rest days so I can stick with a high mileage running-centric schedule. I know that cycling is the main element of a tri but find running as an aerobic activity is easier to fit into my life as I have 4 kids to juggle too. It has been said to me many times to get on my bike! In particular as I once cycled into the back of a parked car so my road handling skills could do with some work

Edited to say VLM is the first marathon.
Edited: 28/01/2011 at 12:47