Well last night I had an S15OC mini meet at my house with myself, Matt_S and JEZ 8553.
Sods law the car ran fine the whole time
There does not look to be anything lose anywhere on the engine bay so it looks most likley to be an ignotion coil.
I think Ill go and get a new one as one is obviously on its way out.
That way when/if it happens again I have one to replace it with wherever it might happen
Thanks guys.