I think somebody needs to do some serious research before they get any decent answers.
You want to do a Type Rating in a 747 for a start? Can you imagine the cost of having a 747 to do the 6 take off and landings?
It costs £20k for a 737 / A320 TR with 6 take offs and landings.
Line training for say Raynair can be seen here:
https://pilot.cae.com/Programs/Ryanair.aspx?prog=6
Line training will be provided by Ryanair from one of their many bases. The number of sectors varies with the experience level of the pilot. It is estimated that low-hours cadets will fly approximately 90 sectors, and experienced JAR 25 pilots approximately 30 sectors at a rate of 50 sectors per month.
If you do a JAR fATPL course in Spain/Greece etc then there is no need to convert for the UK. If you do FAA training in the US (tempting with their low prices) you'll need to convert FAA CPL and FAA IR to a JAA CPL and MIR.
I can't see Virgin Atlantic looking to stick you as a FO on a 747 any time soon even if you did manage to raise the cash for a SSTR.
They say 2,500-3000hrs but you need more, including comercial jet experience. Type rating a big advantage for the A340.