I had 245/70/16 on my 98 Disco. Not a single problem. They gave a nicer ride than 235/70 on the bitumen and were still OK in gravel (not too much floating). I'm thinking of going 245/75/16 muddies for my next set on my 99.
You may want to consider 225/75/16 if you want to stay strictly legal. They're taller than the 235/70 and only a little narrower (better on dirt roads) and they're light truck construction so they're less likely to get staked.
Norm
2011 D4 TDV6 (Audrey)
99 Defender 130 single cab ute 300Tdi (Mabel)
99 S1 Disco Tdi (Grumble)
-ex 97 S1 Disco V8i (Beast)
-ex 94 Defender Tdi (Antichrist II)
-ex 98 S1 Disco Tdi
-ex 78 Strangie (The Bucket)
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