Thanks Heinz and Richard.
Richard your photo is exactly like Derek's car. I suppose a good possibility of contamination from the breather seeing it is fairly close. On searching this problem t seems to be a fairly common problem. I presume the breather is not repositioned from what is in the Mustang. The pictures look similar to yours Richard and the car in question.
Heinz my German is non existent so I take it it is specific for MAF. I believe down here there is a CRC product.
Thanks again.
Doug