As above ^^
BUT
If it is just off-raoding you want it for and intend 'tricking it up' or similar, may I politely suggest you get something later (90 / Defender) as spares and repairs will be easier and a now classic car won't get butchered as such. Just a personal point of view.
That aside, if classic motoring is your thing, then go for it! Series 2s are more than capable off road, often more so than later models, dependent on the drivers skills as always. It maybe on an 80s plate if it is ex-military, but as above, check withthe DVLA etc regarding plate re-issue.