A belated follow up. I've been driving on the blowing exhaust for the last year but MOT now due. I hummed and haahed and decided to give the Polish cheapo a go.
https://www.ebay.co.uk/itm/151745291...YAAOSwg89hC0Xb
Delivered quickly £70 fitted well no issues. It does not have the final rear box so is a little noisier but that's no problem as the car is local runabout no longer doing distance cruises, that's what the XC60 is for, I'm in the bangernomics category with the V70.