After putting up with this smell I had the Mechanic check it out, answer was Oxygen sensors NFG so $1k spend to replace the pair.
The fuel efficiency has returned and the stinky's have reduced by 50%. Got the feeling it's a Catalytic converter that died whist the sensors were pumping fuel in to it, Any one got a clue or comment??

 

Hi can any 1 help the smells are slowly killing me.

 

I now have a pair of cats to fit will advise the out come and costs in due coarse.