My mobile rang once, then stopped. One missed call. Strange! So I Googled the number that called me, 0844 648 0255.
Apparently, this is their usual thing; one ring and that's it. If you call them back (I didn't) you A) incur the cost of an 0844 call, which gives them revenue and B) you get asked if you "had an accident recently, that wasn't your fault".
So it's two scams for the price of one. Neat.