Prius specialist in London

I am having quite few serious faults with my Prius. Because of either of the incompetence or extreme charges of the main dealer I was forced to complete some repairs myself, of course with the help of this forum. I can proudly say were all with positive outcome. Unfortunately can't say the same for the one I paid for. Due to the health I can't do repairs myself anymore.
Therefore I am searching for an honest and knowledgeable Prius specialist (yeah I know specialist should be knowledgeable too ) in London area, who won't charge me an arm and a leg.
Has anyone heard about The Prius Centre based Constable Cres, London N15?
Many thanks in advance.

 

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Sorry for another bump. But need to know about these and perhaps some other ones in London. Many thanks.