I went through ETA (http://www.eta.co.uk/). They seemed to have the best balance of cost and terms and conditions. You have to pay an excess unlike Cycleguard but the coverage is more thorough since Cycleguard will only replace whole bikes and not wheels, forks whatever else thieves want to steal these days. I ended up paying £105 for £925 worth of cover.
I went through ETA (http://www.eta.co.uk/). They seemed to have the best balance of cost and terms and conditions. You have to pay an excess unlike Cycleguard but the coverage is more thorough since Cycleguard will only replace whole bikes and not wheels, forks whatever else thieves want to steal these days. I ended up paying £105 for £925 worth of cover.