The London police were warning Merc owners last year/2004 of a spate of thefts of W123s and the early E's, by no means classic cars
Nice cars were literally spirited away, never to be seen again. It took months of surveillance for them to work out that they were being nicked, stripped or driven whole into containers and taken straight to Lagos. Taxis in Lagos are, apparently, predominantly 123s/E's....
Go figure
Alarms are not worth the money, IMO. When was the last time you paid attention to one going off? Get an immobilier fitted and a tracker. And hope your car doesn't get lifted
Another tale... A DB5(?) disappeared off a posh London street last year. Broad daylight, a crane/low loader pulled up, lifted the car and drove off with it. Neighbours watched this and assumed that either it was broken down, being reposessed or was illegally parked...