Mobil owned WJD 501, 502 were built by Tulloch in 1969 to carry petrol and distillate. They were sold to BP in 1985. Both were listed as class ATDY in 2010. Four more tankers (4618, 4619, 4620 and 4723) ex NSW NTAF were also listed as ATDY in 2010 but I don't think that they were the same design.  More photos can be found here.

WJD Diagram