Right,took the header tank off today and cleaned it out.I have given the car a run and will do the same tomorrow.After that I will loop the modine and do the same and see if there is oil.The next step will be to loop the coolent pipes on the turbo and repeat.If I still cant eliminate the problem that way,sniff test it is.Its a bit long winded I know but I should be able to pin point the problem.CheeRS everyone for your input.