It's not just up north, we're having this happening in the Midlands as well. A builder friend came out of his house to find his bonnet and doors had gone on his 90 and my brother-in-law came up to visit and had his brand new land rover 110 cased in the local Tesco car park by some right looking rogues.
Carpoint Leisure Battery Cut Off Switch the switch sits on the live battery cable and the key completes the circuit so just take it out at night, that's what I had, though many a time early in the morning I couldnt figure out why the car wouldnt start DOH!
Any landy owners are more than welcome over at Welcome to Landy Watch. Keeping an eye on your Land Rover
What about a wheel clamp?
Well, there's some good ideas coming up, but being the owner of a 96 disco 300 tdi I have a little trick under my sleeve :).
So, with an EDC you need to find your positive feed on your loom. Extend this and put a switch under the drivers side dash (inside the drop-down if you like). You could also do this with the fuel solenoid. Once switched off, the damn thing won't even start. :D And if you really like to tinker, you could put a cut-off on the fuel lift pump, but that can be a ball ache to get to.
I have also seen the big motorbike locks pinned to concrete driveways and the chain wrapped around the rear axle.
None of this will stop them stripping it of doors or hoods, but it will keep your LR pretty safe.
The problem with a battery cut-off is that any primary alarm/immobiliser will cease to function.