certificate of installation of immobiliser lost

[Barnzyuk]

thacham basically denotes a good immobiliser. if an imobiliser complys with guidelines set by thacham it will become thacham approved, which basically tells the insurance company that the imobiliser you have isnt a load of old crap. so immobilisers from any manufacturer this can apply to. alarm/immobiliser's are cat 1, whilst normal immobilisers are cat 2.

im pretty sure this is the case, correct me if im wrong

[boneybradley]

Thatcham approved means it has resisted attack by the dodgy blokes from the thatcham lab........and to qualify for a cert (for insurance etc) it needs to be fitted by someone qualified by the vsib (vehicle security installation board)... That's why you need a fitting cert stamped by the installer to gain cat2. 
I used to sell microscan cat2 immobiliser's from the shelf for home fitting but for these to qualify you needed to get it fitted (or tested) by an approved installer

[lasci]

Thanks for all your help everyone, bit the bullet in the end and had another immobiliser put in, all insured now which is a relief! Def looking to change insurance companys at the next renewal, our one was most unhelpful when trying to sort out this problem!