Notes
Steady start and gradually moved up though the first 5km was quite easy and next 5km not too taxing. Thereafter it was quite hard going, and after 16km felt tough. Plan was to go easy at first and pick up later, did that though the pick up wasn't very fast. Gave it everything at the end. Beaten by a few people who normally I should beat, but that was expected and I didn't have the will power to race a full 21.1km.
Bit warm at the end - took 3 gels and 1 salt tablet. Both seemed to have some impact, felt better after the salt. Need to get some calf compression socks.