elsu:does a factory fitted immobiliser count as a factory fitted security system for the purposes of claiming for theft or attempted theft of insured car?
This would depend on the company's specific underwriting criteria. If they have specified that you must have a Thatcham Approved immobiliser then you must have one. 'Factory Fitted' could mean either a non-Thatcham or a Thatcham depending on the year of make, model and when insurers started insisting on the approved immobilisers for a discount.
What car do you have insured? What year of make? What insurer are you with? Within your documents how does it read under 'Immobiliser'? (ie. Unknown, Unspecified, VSIB approved [you must have certificate], etc.). Come back and let us know.