Having received some feedback from 11890 in response to a couple of questions, and after checking my O2 bill, I’m not so sure I was correct about the cheapest National Directory Enquiry number any more. Yesterday, I said that 11888 was the cheapest – and based on their pricing compared to the other providers on most phone packages, they did appear to be so. However, while their per minute charges are amongst the smallest, they (after checking twice) are the …