Replaced the rag top with a cab, fitted with door and window locks.
While not as secure as a more modern car, it keeps your shopping reasonably safe, and the vehicle is unlikely to be stolen except by a very determined thief. If concerned, you could consider locks such as a steering lock bar, and it is relatively easy to fabricate a clutch (U-shape steel that fits round the series 1 clutch pedal and is padlocked in place) or handbrake lock Similar, but prevents the handbrake from being released. Also seen a fitting welded to the gearstick (could be secured under the knob, but less secure) which meets a fitting wlded to the dash when in reverse, the two being linked by a large and obvious padlock.
Then there are simple procedures such as leaving the transfer case in neutral.
I have seen advertised, but not recently, keyed one way hydraulic valves which, inserted in the brake line, prevent brakes from being released once applied.
I will comment though that having driven Series Landrovers for over fifty years, I have never had an issue, although I have had more peace of mind since fitting the cab. I suppose it really depends on where and when you are parking it!
Hope this helps.
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