Thanks Quick Start.

The pain in the quadricep happened straight away (i was doing a 30 sec sprint), i felt a sharp pain and had to stop running within 10 seconds of the first sprint.
It feels ok now but i haven't tested it out running, i have managed some gentle Quad stretches yesterday.
I thought it must have been only a strain as i can weight bare and i am not limping at all, i can still feel a little discomfort in the area where i first felt it pull.
I am keen to get back running ASAP as i have a race coming up in 4 weeks.

Cheers