I'd guess at around 74 or 75 - only part time [weekends]
I have something nagging a retired brain cell that the fella who owned the newsagent in Lustrells Vale [Saltdean] also owned the franchise Wimpy [can't remember which one]
My big sister [Annette] also worked there, probably 72/73/74 ish
I worked in the Western Rd, East Street and Old Steine Wimpy's during the 70's - staff were fed "in house" - highlight of the day ...
Marvellous scenes ....