OK, here's some very rudimentary arithmetic:

Let's assume the population of Manchester is 3,500,000 (probably way out but it'll do for these purposes)
Roughly (er.. let's avoid that word...) approximately half of those are male - that's 1,750,000
About half the males might be aged between 20 and 50 - 875,000
Let's assume that nine out of ten of these are married or happily shacked up - leaving 87,500.
Take away from these the arsehole who tried to beat you up...

That means that within your lovely city there are 87,499 men available to you. Happy hunting!

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Erotically yours... Gus