Bruce probably borrowed the Grimshaw from a friend.
This Grimshaw is a "SS De-Luxe" so called because of its shortscale. It was hand made by Emile Grimshaw and Son had its own unique style of tremolo/vibrato arm and were normally made to order. All the switch was on a plate in the lower bout and the pickup selection was by a rotary knob. Grimshaw guitars were considered to be the nearest to Gibson at the time as Gibson weren't easy to get hold of.
Thanks to Tony Allen for the information, who also owned a Grimshaw, Troubador De-Luxe.
Click on the picture to watch The Drifters, with Jet Harris, Tony Meehan, Hank Marvin and Bruce with his Grimshaw.