Is there much money in Dry Cleaning?

[paddyhasneeds]

Perhaps a slightly odd observation but last week I was in London for a day and had several hours to kill so did a lot of wandering about Central London on foot.

There seem to be loads of Dry Cleaners in Central London, which struck me as odd as I'm assuming that rent is a small fortune.

Perhaps I'm being naive and the sheer quantity of people means there is a lot of trade?

It just seemed an odd thing to see so many of in a city centre.