That reminds me... I was in a car accessory shop recently (which shall be nameless as I don't want trouble again), and upon taking my one £5 item to the till and holding out a £5 note, I was asked by the assistant 'do you have an e-mail address?' I said 'is my purchase going ahead conditional on me giving it to you?' (Momentary embarrassed silence from the assistant) 'It's so we can e-mail you the receipt.' (!) 'Yeah, and deluge me marketing mail forever.' (Assistant's silence again) 'Can't you just print a receipt from the till?' 'Umm... I guess I could.' 'Ok, do that, please.' I realise he was acting under orders, but this transparently cynical policy clearly hadn't been thought through at head office!