Is there anybody who can recommend me a good Citroen Technician in Birmingham area?

[VictorRO]

Good evening!
I am new here. I have bought a 2018 (25 k miles) Citroen Berlingo last week.
Today my car is in Citroen dealer garage for diagnosis because on Saturday broke down due to gearbox fault.
As long I do not trust on the dealers policies and prices, I would appreciate any garage or technician recommendation who deals with Citroen cars/vans in Birmingham area.
Thank you!