Mobile BMW mechanic in Croydon

[Easy_Targa]

Hi all.
My daughter's E89 Z4 (2.5 litre straight 6) has developed an horrendous squealing noise from the engine. It's not belts or water pump and I think (from YouTube!) that it might be the PCV valve that has failed). Local garages have proved useless or unwilling, does anyone out there know of a good specialist in South Croydon area who might be able to help?
Any experience of a similar problem also welcome by the way!
Cheers

[Tinkermantony]

Bit of a drive but Munich power in Redhill are supposed to be very good

[preacherman]

I use KMK in Croydon who are decent. Have always been honest even when opportunities arose where they could have pushed their luck. Lithuanian guys so don’t go in there expecting coffee and hugs though.