So we had to have 2 goes at this .... firstly thanks to Voicey and the team at AV who trie day adding mini cats but sadly the CEL came back on after less than an hour......and only because they are closer I took the car to Autoficcina (with no disrespect to AV Engineering who are lovey people) but a bit far away.....and they diagnosed leaking cam sensors on the RHS. Two sensors changed and seals replaced and a chunk of cash later and no more pesky CEL.