I assume by James you mean the guys at Harding Performance?
I have had no problems with them, in fact they did both the state 1 and stage 2 ecu update on my car and the engine mount.
If you are looking for alternatives i believe there is a guy down at cleveland that build's custom tunes (bayside performance services i believe it is) but it would take about 4 hours from what i have heard.
The Tiguan is not on their list of cars at the moment but it runs the same engine and turbo as the Mk6 GTI so it shouold be the same.
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