Rich170, thats very kind I may well take you up on that. I ve order a bosch post cat sensor now which should be here tomorrow so fingers crossed its that.
When I phoned Ford and they said they couldn t say for certain I thought that was a load of bull because thats the whole point of a diagnostics system.
From trawling all the posts changing both the lambdas isn t a terrible idea anyway for running and fuel, well this is how Im justifying the £120 in my mind!