Two thoughts.
First, what are these numpties doing nicking such a distinctive and low value (no offence, mate) car? I can only assume they took the risk breaking in to get the Elise or the Zed.
Second, I can't agree with taking the keys etc upstairs. Plenty of these scumbags are quite happy to deal with any resistance from the homeowner and may well come looking. Unless you're pretty handy, my view is that a car/wallet etc can be replaced but you or your loved ones being attacked is to be avoided at all costs.
Hope they get the bastards for you, mate! Get Ming on the case - he'll sort it!