Can you identify the mark on this tantalus please?

British Silver Reading Silver Hallmarks
#1

Hello,
I don’t recognise the mark on this silver plated tantalus. It’s the only mark on the piece & I assume it to be the makers. Can you identify it please?
Many thanks
CIMG4734.JPG

#2

John Grinsell & Sons of Birmingham. See here.

#3

Many thanks for the swift reply