Later 70s product as it looks like a Grand Prix, Cyclone or Stadium/Circuit model...
Thank you. I discounted a couple of them as there was not brazed on pump mount, but bit sure if the changed that year on year.
I am very chuffed with it though, I think I'll just generically restore it as a Carlton and not worry about defining its model. Last night's mechanical inspection revealed nothing other than it needs a strip down, service and rebuild. Replacement cables, chain, tyres and tubes will be on the cards too.