The most common and most likely answer to this crossword clue is the 8 letter word CITYWIDE
I've seen this crossword clue in Independent
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More clues leading to the result CITYWIDE
Buddy explains!

The straight part
We know that "throughout London?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case throughout london? = citywide.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CITYWIDE mean?
CITYWIDE adjective- Throughout a city.
- Throughout a city.
- (chiefly Philadelphia) A combined order of a shot of distilled spirit (especially bourbon) and an order of beer