The plot on this thickens,Tommy came over to day to have a look,found there was oil in the turbo pipes but not excesive (he checked this with a mate)it was suggested that the turbo wastegate might be the problem(checked turbo all was working).
Tommy had a bit of fidling with wastegate were not sure what he did! however I started it up and took it for a wee run and it was back to normal,my gut feeling its been fuel what with getting on and off recovery truck and me starting it every otherday its cleared.
Any further thought ?
ps if i got any of that wrong T please feel free to correct
pps thanks for your help thats from S too