Have now decided its not worth it :-
The free year they are offering is just for navigation, so the second year would cost £120.
The camera warnings and tracker taken together would cost £288 for the 2 years.
So thats a total of £408 for the first 2 years, plus £264/year thereafter.
Now I just need to find the damn thing to remove it, had both driver and passenger lower halves of the dash out and the wiring seems to disappear down under the front part of the centre console so the next job is to figure out
how to get that off for a look.