Virgin apply a 30k bond reducible monthly over 30 months where they pay for the endorsement, payable if you leave the business.
You also have a freeze period of 30 months, which means you can't change types inside the 30 months.
The true cost of the training is well in excess of 30k and in the current EBA negotiations they are trying to up it to 45k, which is still well below what it actually costs.
The bond isn't a bank type bond where you put up money and it is held essentially as a security deposit, it is just an amount they can recover from outstanding monies owed and send you a bill for the rest.
Now before anyone was a rant about how it doesn't cost 30k or 45k or whatever, the amount paid to the training provider is only part of the cost.
Even if you do the training in house you need to provide the training facility, licensing for the courseware, the cost of the sim in both fixed base and full motion, the cost of providing the various instructors and check pilots. You also need to pay your wages, and if the course is not in your home base then they pay allowances, accom, and have you offline not being productive and earning a quid for the business for a good two months.
Even if the type rating provider charged say 15k, allowances, accom, salary would bring the amount to close to 50k assuming you were earning around 150k a year. Add super to that, the cost of a supernumerary FO during the first few sectors, the cost of the training captain (there is a differential cost between the cost of a line Capt and line FO and a training Capt and a trainee - particularly if the trainee is a capt) and the real cost of the training mounts up.
As an aside QF are charging external customers over 70k for a 330 endorsement and many providers in Europe are charging 30000 Euro for a type rating.
That all said I don't believe there should be a bond or freeze period for forced transfers, if you put your hand up and said I wanted to move to the new type fair enough, but if the company is forcing the move then it should be the company that bears the burden not the pilot.