Well I had another look at this filter [ in the day light ] as before it was 4pm and I can now see the problem, the thread on the filter only goes 2/3 of the way in so of course there is no proper connection
Still need to get my money back though
Have put the old filter back on for now
BILSTIEN DAMPERS, 4-2-1 MANIFOLD, HEAD WORK BY SABRE.