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Thanks again for the advice, wouldn't have thought of making own recording of the interview.
He doesn't clock in or out unfortunately, and although we're racking our brains to remember the day, it was over 8 weeks ago now (that's another thing, why has it taken so long before he was contacted, he hasn't much of a hope of recalling the day now). And unfortunately, of his two colleagues, one is currently abroad and the other off work sick, so neither is around to help piece together the day. One thing which has dawned on him though, is that he always has his dog with him in the van (a very distinctive dog) which always sits in the passenger seat with him, so if the woman didn't mention this, would that help to prove mistaken identity? Also, the description she has given doesn't fit my husband at all - she described a man with brown hair, my hubbie is bald with a beard.
Ah, well, he's off to the Police Station tomorrow, so we shall see what that brings.
Thanks again for all your advice, it has been a great help.