Typically, to get anything like decent insurance rates in the UK you need a Thatcham-approved (UK insurance research unit) alarm and keep the bike in a garage. Without either it's much more expensive. The UK sourced alarms are probably significantly more expensive than the US sourced ones you will get recommended on .org, BUT they get the insurance break. As a US serviceman, you may have different insurance, so you act accordingly.
If you decide to go for expensive UK sourced units, ask again!
Oh, and we have Datatool registration here which puts a computer registered code on your machine in several places and reduces the thief's chance of selling your bike afterwards, and so reduces your chance of getting it stolen. :thumb:
Replacing stolen bikes is the majority cost of bike insurance in the UK :thumbd: .