No, none of the class 15s were painted standard BR blue.
Any photos of locos with BR double arrows and full yellow ends will be in green livery.
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However, people seem to be confusing the instigation of class numbers with that of the TOPS re-numbering. The class numbers were introduced around the same time as the end of BR steam (Aug 1968).
If you have access to the railway periodicals of the time, you will find the lists of class numbers in there.
Martin's 'from memory' list is almost correct - except that 02 was Yorkshire Engine/Rolls Royce 0-4-0 D2850-69, Class 10 were the Blackstone engined shunters within the 08 number range, class 11 were ex-LMS 0-6-0 shunters 12033-12138, class 12 were the ex-SR version
15211-15236, it is a moot point as to just how many cl. 16s were still operational at the time the class was annonced, but a few must have just made it.The A1A D600 Warships were withdrawn by the time the lists were published, and therefore were not classified.
Officially there was no class 41, but with a gap between 40 and 42, it was assumed by many that the class list may have been drawn up prior to their withdrawal and class 41 removed before the public announcement.
I think, therefore, that they have become honorary class 41s
Also there is no mention of class 80 in the official list.