In reply to TheDrunkenBakers:
My understanding is that from a DVLA regulation basis it is the responsibility of the driver to ensure they they are fit to drive and can ensure that they can handle and be in control of the vehicle at all times. The driver must be able to demonstrate this to Police if required. This is the same before and after your operation.
So primarily you can decide when to resume driving as long as you have not specifically been told not to drive, but within all the best available advice given to you. That is the catch - if you were to have or be shown to have caused an accident, and if was discovered your surgeon told you not to drive, you would have problems all round. The vagueness is when your surgeon mentioned rather than advised you not to drive.
To help cover you, you should ask the surgeon again ideally after the operation and confirm what that advice is for - to help recovery or because he thinks you are unlikely to be fit to drive in full control for say two weeks. If in any doubt, assuming you don't want to get an independent driving assessment which is another route though usually for long term medical conditions, you should not drive for the 2 weeks or whatever period your surgeon talks about.
Post edited at 15:29