There may well be those with more legal knowledge than me (quite likely really) but in discussions with others I have been lead to believe/hope that there are limits to what you can be bonded for and how much. New qualifications (ratings etc) are one thing but surely it cannot be right and hopefully not legal to bond someone for a currency check. If it only costs say £5K for a type rating surely it cannot be reasonable to bond you for more than the cost.