Why don't you just disconnect the down pipe from the cat?That's all I ever do.
Did you buy a replacement one Len as I've got a low mileage Febi spare up for sale at the moment - £15 postedInfact, i've got loads of ABF bits and pieces up for grabs if you need anything mate?
Ok no worries, I would have kept it for myself but having just checked the part numbers I believe the TDI one is different so useless to me.