http://www.worldnomads.com/
Travel insurance that you can buy and renew abroad. Starts from £25/month excluding USA / Canada / Japan or £30/mth including on a 10-12 month contract. Optional high value item coverage if you're at currently home.
http://www.burnett.co.uk/
Laptop and camera insurance among other things. I had a relatively inexpensive policy from Burnett in the past.