rhet I just think a race planned would give you something to aim for, without a race, training does kind of fall to the plodding along (for the majority of us, not just you!). I would look into doing a hilly one if I were you, that would mean you get out on those hills. You only have to do it once a week or fortnight to get the benefits, I can't say enough how I fly on the flat now. My 8m/m pace is now classed as pretty easy to me and when my friend and I did our hill intervals the other day, we were laughing how easy they are now becoming. Base fitness is enhanced dramatically. Your call though, you will have a newborn baby too.
I am definitely going to do Loch Ness. Will have a word with DH later when he arrives home, see what he thinks. Could hire camper van and make a long weekend of it as close to his birthday or I will look into Loch Ness hotels. DD2 will be starting school though so have her to consider. Probably won't do the GNR too, it's not easy juggling 3 kids so two races in two weeks (and huge ones) may be a bit mad. I've done the GNR but the Loch Ness Marathon looks amazing. Not a bad elevation either, I was presently surprised!
I have just fallen down half of the stairs. Ironically, I tripped over the hoover wire. 
DD2 and DD3 been particularly hard work this morning and I burst into tears. Sobbed on the stairs and DD3 came out and said "Mummy crying" and waltzed back in to her room to play. It soon shut them up though. Got big carpet burns down my arms, on my arse and on top of my back. DH is going to think I've be romping with Winston while he's been away.