I don't know why I didn't take a picture of the big 'SEGA PARK' sign outside. oh well. Have what I could find that was recognisable~
I know a Sega fansite documented this place too before it died out.
And here's someone else's pictures of Sega Park Southampton from 2008.
IIRC, this arcade was using the Sega brand long after their license expired but they didn't care and neither did Sega, incidentally.