Having lived in Wolverhampton for a number of years, I suspect the street food you refer to there is the appalling “Mr Sizzle”, without a doubt the most appalling burger of all time, rolled out down the football ground and late at night to catch the unsuspecting drunk.
Wimpy is largely gone in the uk (I am surprised someone mentioned seeing one in Berlin, I only ever saw Wendys for a long time in Europe, McD’s took until late 90’s to make it over there), it didn’t go out of business, it got bought out by Burger King. It went out of fashion (and Burger King in the UK has too, that has all but disappeared from the high street and is a motorway service station/train station chain). I personally think the Wimpy Quarter pounder (it still exists in some places) with cheese is the best chain burger in the uk, far superior to the McD’s effort and the pressed thin pate cardboard of BK. However, here a burger is far less about the food and far more about the toys for the children, and in that sense BK also lost out a long time ago
And yes, I’ve ate Burgers in the US, Vegas, NY, LA and SF. Though yet to try that In and Out place, seems a shame to use a chain over there…
It has probably improved now. Having visited Budapest about 10 times now, I’d say I’ve never been tempted to try a burger in many places apart from that one I tried in that “English Bar” (I think it was called Bulldog or something) by the Danube. I’d be on the goulash or the other massive chunks of meat they serve in their restaurants.