Hiya,
yes RMASMASTER PM'd me rcently and quoted:
" During hostilities only, sea going craft were painted overall grey with no distinguishing bands etc, harbour craft which included all TID's were painted as in peace time, which was buff upperworks and funnel with black hull and gunwhales. The funnels where all about 18 inch black top with a 3 inch white band, 9 inch red band and a 3 inch white band. In peace time the sea going section red band was 18 inch's not 9 as for harbour craft. The gunwhales had a white band which was carried by harbour craft at all times but not by seagoing craft when painted grey.
Prior to the inception of the PAS, the CD tugs had azure blue bands, the victualling craft which included water boats where green bands and oilers where brown bands.
It gets a bit confusing because I believe , though not totally sure that the Dockyard ports during PAS had there own distinctive colour on the gunwhales for each port, Chatham was for sure azure blue as I joined the PAS service in 1974."