Even for collector it’s about £50 too much Martin, http://www.ebay.co.uk/itm/FROG-1-72-SCALE-MODEL-KIT-RED-SERIES-WESTLAND-WYVERN-/150953214442?pt=UK_ToysGames_ModelKits_ModelKits_JN&hash=item23258341ea
The Frog Wyvern never seemed to get that rare, you still see them built and can be got for around £8, so a cheap way to make one if on a budget.

1:72nd Frog, Trumpeter, CMR, Czechmaster, & Magna (T.3 conversion), 1:48th Trumpeter, Dynavector & Classic Airframes, and a 1:32nd Tigger vacform, the type seems well kitted for a relatively ‘obscure’ British type, its brutish presence propbably helps!

Diminutive version here, http://www.ebay.co.uk/itm/1-144-Westland-Wyvern-HMS-Eagle-CafeReo-SPECIAL-13-/121018504854?pt=UK_ToysGames_ModelKits_ModelKits_JN&hash=item1c2d43d696

Or if you have the money, http://www.ebay.co.uk/itm/1-144-Westland-Wyvern-HMS-Eagle-CafeReo-SPECIAL-13-/121018504854?pt=UK_ToysGames_ModelKits_ModelKits_JN&hash=item1c2d43d696