Juliet, the idea was that this was a recruiting and retention incentive. In other words, you have to achieve 2000TT before the scheme kicks in. It then depends upon the type of flying you've done in the RAF; pretty obviously TriStar/VC10 etc time is more relevant to ATPL equivalence than rotting around the weeds at high speed in a FJ - fun though that might be!
The last thing that was needed was some 'Minimum time, sign up and poke off' scheme which would facilitate early exit from the Service. In any case, that would have killed things stone dead. The scheme which was finally agreed between the RAF and the CAA strikes a good balance between time served, type of flying achieved, experience gained, the needs of the Service and the expectation of the individual in post-Service life.
<2000TT - you don't qualify at all.
>2000TT - you get some exceptionally good credits.
Decide which you wish to do - it's your choice... But all to do with retention incentives.
Only 30 hours PIC in 1200 TT? Is that normal these days? Of that 30 PIC, how much is on anything other than light aeroplanes?