sorry to hear about this
must disagree about leaving the keys downstaires tho, always hide them!!!, my mate had this happen to him, they left without the car tho as they found no keys! (and nothing else was taken) and a house further down the road was targeted and they did make away with the car.
on another note, at the printers i use, a guy their just bought a mk 5 gti, off 2 asian lads he stupidly met on a layby (car was advertised in the trader), did the deal, brought the loverly car home, 2 weeks later police at his door telling him the car was stolen and they were taking it back, he has lost his 7500k !!!
the asians were from the manchester area..