No direct additional costs as such, but you will obviously have to cover the indirect costs such as living and fuel for the vehicles over that extended period. I am not entirely sure whether the cadets is responsible for the extra insurance cover, as I seem to remember getting an email from PJ Insurance a few months ago saying that my cover period had been extended and I didn't pay them any extra so maybe CTC covered that. You will also have to bear in mind the additional interest on your respective loans over that period. CTC have just published a document that introduces a new compensation scheme for delays during training but there seem to be a large number of clauses in there - either way CTC are thinking about it.