@Scottishpete , jokes apart, welcome on board. Well, it has been a long day, so please do excuse some fun
We can see from your profile that you have a T5 SE. Does it have the standard head unit? Also, when you mention you've lost bluetooth, is it that the phone is unable to discover the stereo, or is there some other problem?
A few pictures or some more explanation of the problem may help us to help you with pointers to diagnose the problem.
if you can provide some more details it will help a more targeted response.
Confirm van year
head unit type / code (I.e. Rns510, Rcd etc)
actual problem experienced
attempts to remedy etc.