About 40 years late-
but there was an enterprising guy who opened a Burger takeaway in Ewell, in a parade of shops opposite the cinema.
He had a charcoal fired grill and made and flipped the best Burgers I have ever had. On a Friday or Saturday evening (after the pubs shut of course) there was always a queue to get in.
When you got in there was a heady smell of BBQ'ing beef and charcoal. Little choice- Burger with onion or not, fries if you were lucky.
But heavens above- the Burgers were chargrilled on the outside and succulent in the centre- fantastic. I think the owner spent all day making the Burgers and opened in the evening to grill and serve them. It has to be said that back then all we had to compare these to was wimpy! BUT these were so good I have tried to find similar and tried to do my own- with little success sadly.
Modern burgers (lower case b) to me are vaguely beef flavoured cardboard.
Oh, the name of this place was 'Stampede'