The DVSA have given notice of a strike by some driving examiners which will take place on Monday 4 and Tuesday 5 December. The DVSA advice the following:

‘You can either: change your test appointment to a later date or turn up for your test as planned, but your examiner might be unavailable’. They have also advised that not all driving examiners are union members and even if they are might choose not to take industrial action.
They have also said that If your driving test is cancelled you won’t have to contact the Driver and Vehicle Standards Agency (DVSA) to rebook your appointment if you can’t take your test because of strike action. DVSA will contact you with a new test appointment within 5 to 10 working days.
You can claim out of pocket expenses if your test is cancelled, but you must have turned up for your test to be able to do this. If you don’t turn up, you’ll have to rebook your own test and won’t be able to claim expenses.