OT Escort emissions failure :(

[Bat]

Hi,
Not VEMS but the Ford EEC system. My new winter run about Escort 1.4 CVH EFi has failed the MOT on emissions. It only fails on CO% @ 0.6, with a maximum allowed of 0.3. HC(60ppm) and lambda pass ok(0.98).
My local rolling road guy says the cat is knackered, but it looks quiet new.
I've dosed it with cataclean, howled it up and down the motorway, but it failed again today
It's been recently serviced and the lambda sensor has been changed too.
Tested lambda, seems ok, switching between 0.2 and 0.7. Disconnect the lambda and the injector duartion goes up 1 mS, which is what my tester says it should do...

Any ideas?
Cheers,
Gavin