The side numbers you refer to are actually called pennant numbers.Sam,
Sorry I can't find your tug site.
The side numbers for the three sisterships are:
RMAS Roysterer (A361)
RMAS Rollicker (A502)
RMAS Robust (A366)
The site you have found evidently shows Robust and another of her sisters.
Can you try going back to your site sometime and carefully copy its address.
Cheers and well done, (Thumb)
C.D.Holmes,Beaverly.In the 60's or 70's I am not sure whether again it was on the tyne or on the humber: There where 3 new deep sea tugs built for the admiralty, and | wonder if they are still around.
RollicKer, Rollister and ??? Nmaes escape me precisely??? Buit at Clelands/ on the Tyne or at Hessle on the Humber.(Flowers)(ballet)