Shep upsets Martin's London marathon training

Martin's doing the London Marathon in April and his training programme said he needed to do a 16 mile run. That's further than he's been before and he asked me if I wanted to go with him (on my bike, obviously!).  I planned a route that I was sure would be between 15 and 16 miles but, as usual, I underestimated and he ended up doing 18.8!  It all turned out OK because he managed it really well and there was no sign of hitting the fabled 'wall' which often comes around the 18 mile mark.  Martin might let me go out with him again but I don't think I'll be allowed to navigate!