We are in the same situation. We had three theft attempts last year. Only one resulted in a claim as the cost of repair to damage was over the excess (£1000). All this was before Lexus developed the Protection Plate.
We paid to get our protection plate fitted before it was done by Lexus free of charge, had a secondary immobiliser and bollards installed on the drive. Use a steering lock (disclock) both at home and when parking out. We also got the optional extra at the time of buying the car and fitted front and rear dashcams.
Despite all our efforts the insurance quote is coming at over £3K! We only do about 2500 miles a year!
Live others, we have had LV write to us saying they are unable to insure.
Anyone know of an insurer who is prepared to insure taking into account all the additional security measures we have taken?