Hi Foxy,
Please bear with me just a little longer if you can.
Having made a call to my ex-badminton doubles partner (3rd placed amateur males, County Champs 2004) who is a senior IT bod at Sainsburys now, I've called a favour and have been able to secure the CCTV footage from the Badger's Farm Sainsburys entrance camera.
You didn't mention the precise time of the sighting in your original post so I checked with the Badger's Farm branch of Sainsburys myself and they were open from 7am and 10pm on Saturday 6th July.
You also stated 'Saturday 7th' in your post, so as a precaution I'm checking the Sunday footage too.
I'm currently up to about half past ten on the Saturday morning and hope to break the midday mark somewhere later this evening if all goes well. Slightly hindered by a period of reduced light from around 09.18 onwards (localised cloud cover?) which is making detail recognition somewhat harder (see below), however individual screengrabs then brightness / contrast adjustment in photoshop is proving an adequate workaround.
Already I've positively identified two Casios and a Scurfa, and I'm feeling optimistic for a sightling of the elusive Ocean Turtle any time now.
Stay strong. We will find it.