Shins/calves then hurt like L all day Saturday, so had them very quickly looked at by a friend this morning, before the race. She confirmed that it's the muscle that's inflamed and no apparant damage to the bone. It's what it feels like, so great?!
I proceeded to take lots of ibuprofen with my pre-race banana, and little leggies behaved perfectly, indeed even asking "please Sir, can I have more?" while pottling down the road (admitedly at the bottom of a downwards pointing hill) at a "comfortable" pace of 6:48 per mile. Yeah, SIX. Didn't last too long, but of the 10 mile route, I did do the first half in 43:00 and the second half in 40:45. Massive PB, lots of ice-cream to celebrate later! 
Hope everyone else is just as happy today! 