Handy to know, thanks Lewis. Are there any issues I should be aware of? Silverline told me on the phone they would not recommend it, that the tyre could come off the bead (?) and that the world would explode and millions would be killed... OK, maybe the last bit's exaggeration but the gist was they weren't in favour of it.
On double-checking, the only thing Maxxis do that's close is the 37x12.50R16 Creepy Crawler, everything else is too gay small or on 15" rims which wouldn't clear my brakes even if I could afford new rims to go with. Shame 'cos I think the mudzillas look cool.