Had a lot of people looking and wondering where it goes

the plenum I got from summit and the silicone duct I got locally from a place that supplies race teams.
the old heater motor hole was spot on size so I got a mate to cut 2 rings for the bulkhead and fed hose to another ring with connector fixed on.
that is then screwed to the bulkhead plenum outlet hole where the heater was-so all the fresh air comes via the grill below the windshield.
Sounds fantastic inside the car

the whole lot was about £200 and I think much better than sucking hot air from your engine with a normal air filter.