Well I had chance to take a closer look, the indicator is moderatly easy to pop out if prised with fingers from the front... after I took it out, I wiped away a bit of grime and noticed a screwdriver mark on the bodywork.
Looks like it was deliberate, why is unknown of course, opertunist (sp!) or whatever, why go for a car with deadlocks etc on instead of the other cars there I dont know... maybe they had a broken bulb and were going to nick mine.... I dont know tbh!..