UK Bat
Hi Rohan!
If I remember correctly, five Bat cars were supposed (known) to be sold new in UK (pls correct me if I'm wrong):
WGO 375R (1/1/74) Polaris (got this reg plate in 1977)
VMD 880M (1/1/74) Chamonix (got this reg plate in Feb 1974)
UPL 87M (1/1/74) Chamonix (got this reg plate in Feb 1974)
777 DSM (19/11/75) color unknown
LHP 111P (21/11/75) Polaris (got this reg plate in Nov 1975)
As you can see, only the last one has (still?) the original reg plate. Therefore, I would guess that the pictures from the Polaris Bat (BMW 80) might show the earlier reg plates for the WGO 375R car. The alternative would be the 777 DSM car.
In addition and besides yours (imported from France), there is another Polaris Bat in UK (imported from Germany). Namely RYJ 38M/YTA 163L.
So all in all, there are some candidates.
Cheers