Thanks for the advice Carleton.
Like I said, I'm just starting out, so still experimenting either gears etc.
I have a couple of clinics and am a specific track sprint team (blackline) which is really good
Fortunately my local track (Manchester UK) has a mylaps timings, so a chip on bike records splits at 50/150/250m
Quick question- do you do 100m efforts from 0-100m or 150-200m?