Being your from Norwich I am not to sure of the tuners in your area but someone will be along shortly who will.

Exactly that, as it's a FI engine, it's very easy to destroy the engine if it's not setup and mapped correctly.

Some of the choices are:

MSD (Blackpool)
Reyland (Birmingham)
Turbosystems (Newcastle)

I am in a similar position to you as I don't have a decent tuner in my area.

At a decent setup they will pressure test the system for leaks, it's not a lot around £160.

I can highly recommend MSD/Matt Lewis for parts.

Martin