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At a guess it's run by Select Service Partner, who I know run a fair few outlets at stations and other places - Pumpkin Cafe, Upper Crust and Taste I know they definately run at rail and bus stations I've been to,
If only I could use one at M&S in Cambridge station I would eat very well. As a consolation I can use it at the Burger King which must be hiding behing the ticket office or under the platform.
Would certainly be useful to have one if I get stuck in KX for any length of time.