Herne Hill 1 on 1 Training

Yeah, up to high intermediate level group sessions are best, for the simple reason that nearly all training and racing is done in a group. You must be capable and safe in a bunch.

The general process is: 1.induction> 2.group riding> 3.group training> 4.racing.

(too many people try to miss out number 2, this makes them dangerous when they try to do 3 and 4)

If, after you become experienced on the track you decide to specialise or get serious about racing then you'll benefit from a personal coach.

Now, that isn't to say there's no benefit from 1 to 1 for novices, as your bike position/fit and many other techniques can be coached at a more effective level than during a large public session.
I have had very small groups (under 6 riders) of first timers progress far more than they would have been able to during a saturday induction because of the sheer numbers and coach/rider ratio.

Probably best to do a couple of group sessions then maybe a 1 to 1 to improve technique etc. Do I contact you direct Rob or through Herne Hill?