Do you have faith in the bid/offer spread prices quoted for retail bonds, where you are on the telephone to a broker?
I held the same bond with two suppliers. Sold with Selftrade (online quote) ca 111. Phoned up You Invest (AJ Bell) a minute later and was quoted 110 to sell (110-112 spread was quoted). Put in a limit order at 111 and was matched at 111.