Electoral Registers Plympton - held by The Box, Plymouth

[margaretmarch]

Hi,
Is anyone able to get to this repository

The Box
Plymouth City Council
Tavistock Place
Plymouth
PL4 8AX
T +441752307663
https://www.theboxplymouth.com

to check the register for the address 'The Caravan' Hemerdon Plymton Devon for the year 1968 and 2 years either side for the occupants please?

I am helping an adoptee find her birth father.