New Helmet?

There I was outside the door to my office, navigating slippery cobblestones and a badly parked van, when my rear wheel slipped out from under me and I found myself sliding along the ground until my helmet (rather than head) hit the curb. Nothing too serious and the main damage is a rather bruised ego. My helmet doesn't bear obvious damage apart from a bit of a scuff, but I hear that a helmet should be replaced after an impact. Any thoughts on whether I ought to replace (80 quid plus which after Christmas isn't a welcome thought) or just keep using it?
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What make is the helmet? A lot of manufacturers offer crash replacement subsidies
Will explore... Thanks!