Evening Graeme,
No chance to to get back for a look last night mate, visitors!!
Is that the wing-root we see, if so I assume it's a delta. Similar to the Convair Delta Dart before it had the final boat-tail extension and revised exhausts! Other than that, no idea and not going to have much free time today

!
So is it a delta ? Not a Canard? Is that a trace of the fin we see, if so it looks not to have much chord length, unless it's a change of colour that makes is look short. Pure turbojet, 1950's ?