"As you say, Doug, there always seems to be a dearth of RN crew, whatever the scale."
Shapeways is a good tip though.
Have a look here. A selection of RN Officers, POs and Seamen.
Don't worry about the funny scales shown.
I've looked at several and they can all be done to the scale you want.
I strongly suggest that you contact the maker and discuss the material and surface finish you want before ordering.
Some time ago I bought some 1/35 PTB guns in this 'Frosted' material, and found the surface a bit rough and needing smoothing, with acetone or dichloromethane or similar.
Cheers, Doug 😎