Thanks so much for all your responses!
Burtles & Tate were one of the Manchester manufacturers, no?
There is no number on my blue pearline version, none that I can find anyway. The name "Driftwood & Shell" pretty well sums up the design. The lip of the vessel reveals a wonderful clam shell shape with what looks like seaweed and other extraneous "stuff" wound around it, while the handle could well represent driftwood.
Shall we settle on B&T, then?
I thought it might have high Victorian, but the concensus seems to make it very late. 1903 must have been nearing the swansong for ultra-fancy designs like this, as well as the fashion for pearline. Enough of my rambling... thanks again.