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So your calculation looks like this:

The population of the segment		73
x the percentage who buy already		0.77
x the average sale in pounds		£550
x the average frequency		52 x a year
x your expected share		0.10
= your potential revenue		£160,760

Of course, this is a guesstimate, but it does give you a basis to decide which segments are priorities.

So go to it. The world is your oyster!