Hello guys, I have to make a huge & sincere apology, I have not been back on to respond to the topic due to some serious health issues that had me thinking about other things than cars for several month, very very sorry about not getting back sooner, as I always reply to my posts on any forum, I hope you can forgive my tardiness.
I really do appreciate the input & will be looking at getting a replacement O2 sensor sorted asap, as the standing water bit sounds like the same issue dr broon fingers crossed that'll sort the old girl out, just had all the underside welded & reinforced, so she should keep on going for a good few more years =)