You have a legal duty to inform the DVLA if you have a SAH. You do this by completing and sending them their Form B1 - available from their web site. You do NOT have to surrender your licence. It is very important that you don't. In completing Form B1 you give an undertaking to follow all medical advice. Initially, that advice is, of course, don't drive. You then have to wait until your Consultant/Doctor says that in their opinion your are fit to drive. The DVLA's internal rule of thumb is don't drive for 6 months after your SAH but this is just that, a rule of thumb. If you telephone the Driver Medical Team at the DVLA and tell them that your Consultant/Doctor says that your are fit to drive they will give you the verbal OK to recommence no matter what time period has passed. When you submit your Form B1 the DVLA will write to your Consultant/Doctor asking for a report on your medical condition. When this is received by the DVLA they pass this to their Medical Panel who assess it and give a view on your fitness to drive. Note that in the meantime, if your Consultant/Doctor has told your you are fit to recommence driving, you have told the DVLA this and they have given you the verbal OK to drive then you are OK to drive. If their Medical Panel then decide your are NOT fit to drive when they get round to you then you are then told to stop!! Crackers yes but that's the system.
The problem is that their Medical Panel only meet on a schedule decided by them. There is quite a back log. Three weeks ago they were looking at Medical Reports submitted in the middle of December.
In my case, the timings were:
SAH - 19 October 2012.
Coiling - 20 October 2012.
Form B1 submitted 30 October 2012
Consultant said I was fit to drive again - 13 December 2012.
DVLA agreed, verbally, that I could drive again based on the above - 13 December 2013.
Re-commenced driving - 13 December 2013.
Consultant (finally) submitted Medical Report to DVLA - 27 January 2013.
Written confirmation that the DVLA Medical Panel agreed that I could drive again received - 2 May 2013.
Everybody's different and you should follow your medical advice. In my case, I felt fine by mid December, my Consultant agreed, the DVLA said OK and I've been driving ever since. Not everyone is that lucky.
Gwilym