To remove your valver ecu, you will need to unbolt the jack and jack mount etc from the drivers side skuttle. Underneith, you will find a black plastic box with a think cable going into it. You will be able to separate the black plastic box (its ion two halves) and the ecu will be inside (silver thingy with siemans stamped on it) - unplug it and send it to Hillpower. They will charge ya 150quid excluding vat to chip it. When they send it back, installation is just the reverse of removal - plug it in and away you go. Easy!!
Remember to tell hillpower what mods youve got on your car as they have different mappings available. I think stage one is for filter and zorst, stage two (wot ive got) is for zorst, filter, PBV and cams. It all depends but price is the same...
Hillpower really is the cheapest and they do know what theyre doing - think they race valvers etc