Have you tried Barry robsons ?My GS needs a service. I rang Vertu yesterday and they told me the next available slot was at the end of September.
I don’t think that is a good way to run a business but am aware they are down to 3 technicians as they have partner company with one recently.
Tried Steve at Rainbow - he is booked up until the end of October!
Am scratching my head now as to where to go.