Got the Bug up in the air on the ramps today to change the distributor, it's damn low if you don't, new electronic distributor fitted, a play with the timing, followed by a bit of carburettor tuning runs a lot better & no flat spot, hopefully I'm not bragging too soon. Whilst it had it's arse in the air I had a look at the heat exchangers, they are all in place, the passenger side one was working as it should but we were using the wrong lever, didn't realise there was 2, the drivers side as not cable to flap lever on so for the time being a cable tie is holding the flap open, might have to open a window if it gets too warm.