Do not look a gift horse in the mouth, so the saying goes, implying that if something is free there is no need to worry too much about its quality. Just take it. I have always had a problem with that. The most famous gift horse of them all was the giant wooden horse inside which Odysseus and his men hid to smuggle themselves inside the walls of Troy, inspiring the Roman poet Virgil to coin the phrase: ‘Timeo Danaos