| First - Hope yer lady's ok.
second - Worked on Sainsbury design, supervised petrol station electrical installation on site (albeit 10 years past), so, ALL Sainsbury petrol stations have cameras. The installation of internal security cameras is part of the standard specification for the stations.
Most definitely internally and depending upon area circumstances, externally.
The internal cameras would have been operating at all times.
If you write to the sainsbury manager and copy police etcetera you should be able to identify the perp from internal vid and receipt details (if he paid by card). Data protection will prevent you from getting direct access to the info but the police will no doubt have access.
The internal vid should be retained on an individual tape. This tape should not have been re-used.
Don't know the precise legal point on this but I was told by engineering dept that if a vid tape is taped over (re-used) then the tape is inadmissable owing to possibility of "ghosting".
Get photo's - bike,girlfriend(calm down),location.
Best of luck with finding the scumbag.  | 
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