Question

Roughly how many gas lamps are there in London today?
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Answer 1

Answer:

1500 gas lamps

There are still 1500 gas lamps in London. They don't need lighting every night, but the timer that lights them automatically needs adjusting every fortnight to keep pace with shorter or longer days. Before timers, lamps were lit with an 8ft long brass pole with a pilot light – last used around Temple 1976.

or

However, there are still 1,500 functioning gas street lights in London today. There are just five lamplighters left in London who maintain these 1,300 gas lamps, from Richmond Bridge in the West to Bromley-by-Bow in the East. The long avenue of Kensington Palace Gardens is lit only by gas lamps.