The 08 shunters were introduced in 1953, and when introduced were painted black with D1xxxx numbers and no wasp stripes. They were later painted green without the striping and the numbering changed to D4xxx et seq. As far as I recall the wasp striping was introduced in the early 60's at the same tome as the yellow warning panels on mainline locos. Howeve, don't forget that these locos went frequently for many years without going anywhere near works for attention.
Hope this helps
Regards
John