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I collected the boys from school today and chatted to a couple of other parents who hadn't had anyone at their door and then came home to a message on the answering machine from Police Public Liaison saying that she has the same company at her door last night (she must live locally) and that as far as she was concerned it was a genuine caller. She left a reference number to phone back, so might try that tomorrow to see what it was all about. All I can say is that they may want to review their practices and employ less dodgy looking staff. Anyway, all's well that ends well.