Ok, took the car to another chap nearby who checked it and said it was the counter and left the car for almost a week so he cat reset the counter!! Got a call from him saying that despite counter being reset the car still gives the error message i.e. it is indeed the hydraulic unit that has failed.I'm waiting on him to give me contacts on some other chaps in Kent who can recycle the SBC unit.
In the meanwhile I wrote email to Bosch repair service in Germany and they said that any garage can register with them. They will pre-exchange the unit for 616GBP or repair it for 480 GBP after they receive it.