A beast of Gorgoroth from Games Workshop.
Sadly they retail at £44, not a demented price (some 1/72 kits are a similar price) until you realise the model is cast in crappy brittle resin and is likely to fall apart at the merest touch.
A trip to that highly useful budget shop The Works produced a £1.50 plastic Rhinoceros and after an hour with the milliput and balsa wood we had this
I believe it's being painted as I type. Not an exact copy but good enough. Now we need to source some crew at the next wargames show.