I'm doing much the same as Monique, but am going to schedule in one tempo bike ride a week - probably on the same day as a tempo run is scheduled. I've made a lot of progress this year on my bike times and I don't want to lose it!
I'd like a pb at London but have a lot of commitments this spring(work, university course, the double-edged sword of living in a ski resort) ... so I'm not sure if the full-on training programme planned is really going to happen. I think a lot of prioritization is needed!
I'm going to try and squeeze in a couple of swimming lessons though, as I am the world's most pathetic swimmer and I think that this is where I can get the greatest benefit for the least amount of effort!