I suppose I had always done more of the stretches on the right and neglected the left and perhaps that has come back to haunt me. It's the classic presentation, novice runner 2 months before event who increases distance. Anyway, I've paid good money for an event this summer so I'll have to work hard on the recovery programme:
- relative rest - probably means more swimming?
- ITBS stretches
- gluteus medius strengthening
I suspect that the long run and then a short run with new shoes were a trigger, but the old shoes and lack of stretching on the left had probably set things in motion already.