On oddkiddcreations.co.uk there is a massive guide on how to set the engine up for yourself.
have a look
http://www.oddkiddcreations.co.uk/vi...php?f=5&t=4132
This was put together in a fail safe way incase your engine is not in a decent setup configuration to get it to a tuner in the first place.
Have a look and see if it will help before having to drive to a tuner that is gonna ripp you off. charging anything over £75 is a liberty if you ask me as an ERST does not have that much you can setup to charge more than that.
Danny.