Great stuff TR. I suspected you'd go well past your stated 15
The pace will come back quite quickly as you get back in the swing of it so don't stress it.
RS78 - I think a slow 15-18m in addition to a long run is ideal for marathoning personally. It may be the case that it's something you have to build to over several cycles, but if you keep it slow it can only help you.
LD - if you keep it slow on the road I don't see that it should have any more impact than using a treadmill.
Cheers Dan. And yep, Monday. Nice long run and pub quiz money 
Of course Al_P. Yep, makes sense now. I'd forgottten about the Canova thing, or, to be more precise, was distracted as I had just been looking at some older workouts that were 20m+ with 10 x 800m @ 103%/800m jog. Very nicely executed!
marmite - steered like a cow then?
OS - I read that report. Amazing finish. 5 within 8s!!!