Success, well sort of.
Customer took car away over weekend, MIL off and drove ok but little sluggish.
Phone call Monday morning non start.
Check out. MIl on and TCS on, no compression..
Engine bore washed and flooded.
Got it running and drove to garage.
No live to O2 heaters. Much searching and found lone fuse in relay box blown.
Cause was live feed to ECU signal wire in rear sensor shorting but only at mid to high temp and only for very short periods.
Re did throttle reset and delete stored emission data after battery disconnect.
Result LT fuel trim 0.0 ST switching -4 to +5 and both o2 sensors switching accordingly.
Car now drives good nothing pending on scanner.
Returned car for them to run till weekend then rescan prior to any invoicing, just for my own satisfaction..
Thanks for the input guys...