Did you have to pay a deposit 14 months ago?
A similar thing happened to us, our house took longer and I was worried I would have to re-apply. (I think most offers only last 9 months) but it turns out that we just had to resubmit the information and it wasn't any hassle at all.
I do know of a guy though who lives near me who paid his 10% deposit and by the time the house was completed, the mortgage offer had run out. In the meantime he had changed jobs and when he had to reapply, the bank wouldn't give him the mortgage and he lost the house as well as his €24,000. Even though it was a better paying job, he hadn't been in it more than a year so he did not fit into their criteria. That was an expensive lesson.
The bank kind of are doing you a big favour giving you the money, but if you are not happy and haven't already entered into a mortgage with them then go elsewhere if you can.