Phew. I'm back. Thanks for your posts. Times like this a forum comes into its own. I appreciate that.
Well, the police came and left fingerprint powder all over my carpet. Being burgled is an unsettling experience. If someone pinches your TV you just write it off, claim the insurance, and buy a new one (not to belittle it). But having a computer stolen is iike having your diary stolen. Materially, the thieves took two old G3 machines and keyboards, etc, that I wanted to replace anyway if I had the money, and two screens (one very cheap, the other on its last legs) so the material loss is negligible provided the insurance company pays up. But what are they going to pay on 6-year old G3s if they know anything about computers!? What I want, of course, is the money to replace them with new machines but what they will no doubt pay for is the cost of the items, i.e. not a lot. If so, what have I been paying insurance premiums for? Well, that's another story.
Anyway, I changed as many passwords as I could remember - yes, including the mail servers. I did that this morning and everything seemed to be OK. Them came home tonight and tried to download mail and got nothing but 'authentication error'. Eventually got that sorted after nearly going mad [It's times like this I look back with fondness on the times when 'computer' meant 'ZX81' and 'Spectrum' meant cutting edge.] I had two computers in the room (both gone) and a lot of my backing up was to the other one. The most important stuff went to a server, though. I don't think (hope) I lost too much, but here's another example of the necessity to back up OFF SiTE. But other lessons learnt are to NOT 'remember this password' (in future I'll type it in every time) and to use a laptop away from home (i.e. bring it home every night).
I hope the guys who stole my stuff get crabs.