ImmobiliserDirect.com do our fittings. Unfortunately, no authorised company that fits the Ghost can discount the product as there is a minimum price of £399. Chris who runs it helped developed the Ghost for the RS and has fitted more than anyone in the UK so you have peace of mind its fitted right.
If you click on the link it will take you through to their site where you can book online
I wouldn’t trust anyone apart from Chris Preston TBH (VeilTuning). Mine was installed by someone else incorrectly which led to the car stopping dead on the motorway (even in stop start traffic it was terrifying).
Chris fixed the installation and it’s been working perfectly now for ~ 2 years.