Cheers for the comments guys.
I'd looked at the micro heater that Towed has and also those Spitfire units but i quite like the idea of reusing original parts wherever i can so I'll have a tinker with those 2 Vitesse units first and see what can be done before i look elsewhere.
I've now got the dash vents secured and while I'd like to eventually make some milled alloy surrounds these will do for the moment although i am wondering if they are a bit too big for the cockpit?
Next bit i want to tinker with are the controls, centre console and footwell vents