Yup i got one, but didnt tell insurance for that reason, i put it on in high risk areas as a deterent. I used to live nr Middlesbrough and a friend had his car stolen 4 times. And various others had attempts and thefts. So my punto had the lock on permanantly down there exept when i was at work. (Totaly secure chemical site).
I'd doubt you'd get much off anyway, i asked if i'd get a discount for fitting McGuard locking nuts and they said about £5, i said dont bother then and fitted them anyway for the same reason. A friend had there alloys loosened off in Middlesbrough an attempted theft, she didnt notice until on the carrageway, i was in the back and got her to pull over, 2 wheels were nearly finger tight!