while I was in the scrap yard yesterday I had a quick look at a focus inlet and both 2 and 3 seem to go to the fuel recirc thingy so they should be ok to blank.
Cool thanks for that! Going to use 1 for the ACT sensor, block off 3 and use 2 to go to the ECU.
I assume it will be ok just to put a mini filter on the cam cover breather?