Tarmach,
by the time a pilot has sufficient experience to join Virgin, the training they underwent at the beginning of their career is pretty much irrelevent. Our operation (excepting Virgin Sun, which will shortly be defunct) is long-haul, widebody 4-engine stuff only. The airline some years ago decided that 2500 hours with multi-engine experience (preferably commercial multi jet) would be the minimum for application. Inevitably there are some exceptions to that, but these have never worked well!
For reasons immaterial to this argument, Virgin is a very popular potential employer; we get thousands of applications from qualified individuals for every job available. Therefore the average new-hire at Virgin has much more than the stated minimum. Typical new-hires may be FOs with 757/A320 operators with 4000+ hours, or military fast jet drivers with 3000+ hours, or mil transport drivers (like me) with 7000+ hours, or even 55 year-old ex-BA 747 drivers with 25000+ hours. You get the picture. Whether any of us were CAP509 or self-improvers is lost in the past!
In any case, the conditions under which we started flying were very different to what pertains now, and not very helpful to you.
Incidentally, even the Virgin Sun A320/1 operation insisted on 1500 hours. We did toy with a CEP scheme, which netted four lucky peeps a part-sponsorship, but they would probably not have gone straight to an A320 RHS on graduation. They may have been placed with someone else for some experience-gathering first, or they may have taken the less-satisfactory cruise-pilot route (now also closed) on our A340s and B744s. What will happen now to those that graduate I'm not sure, as the A320/1 seats are no longer available and it'll take tham a long time to qualify for long-haul. Similar questions hang over our younger flight-engineers who, as the B742s retire, were hoping to retrain as pilot and get an A320 seat with us. These guys also have many thousands of hours of long-haul flying, although in the third seat.