I think you're right - http://www.britishrecordshoparchive.org/disc-jockey.html
It became Our Price. I can still just about remember it as Disc Jockey as my older brother bought records from there.
Was the club above the pub, The Town Crier as it would have been in the photo? It's called MODA now and has a club above it now.
The record shop would have been Our Price, surely?
BBC Radio Sussex Breakfast this morning had an interview with Hastings United director Peter Sherlock on all this. 1hr 45 in - http://www.bbc.co.uk/programmes/p04dpv5t
Hastings Observer article on it with a watercolour, for some reason, of what the sports village might look like.
http://www.hastingsobserver.co.uk/sport/football/multi-million-pound-plans-unveiled-for-new-sports-village-in-st-leonards-1-7661956
Interesting and welcome, if it ever happens, particularly to those of us in the Hastings/Bexhill area.
http://www.hastingsunited.com/news/hufc-future-plans--update--outline