Its been a long while since I've seen the movie, but are you talking talking about the Shorland armoured Land Rover? They even had the turret off a Saracen.
There were various marks from Series through Defender
The other option is the slab sided "Hotspur" Land Rover's used by the Royal Ulster Constabulary. Some were complete armoured builds and others a kit attached to a standard 109/110 Land Rover also built by the same company, the nickname comes from the use of the Hotspur armour plating from Wales. Often the kits started on Series Land Rovers and ended up being refitted to Defenders.
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