just an update guys. vehicle eventualy came back in with mil lamp on,checked codes which were:-
p1336 phase detection.
p1327 high combustion missfire on several cylinders.
p0300 random multiple missfire

code p0420 cat aging was not showing i did clear code a second time before customer took vehicle away so i guess over time it reset adaptation, also on checking live data i did notice sensor 2 readings had changed almost copying sensor 1, where i would have expected to see an almost stable .450 but no codes relating to this. The above missfire codes where rectified by fitting a new coil pack