Two letters written by Sir Winston Churchill to the dentist who made his false teeth, telling him that he had been nominated for a knighthood, are expected to fetch up to £1,400 at auction.

The letters were written in 1952 and 1954, when Sir Winston was in his third term as prime minister, to Sir Wilfred Fish, one of Britain's most outstanding dentists.

In one letter, Sir Winston, who was then 79, said: "I am very glad it fell to me to recommend you for a well-deserved honour, I enclose one set of dentures and I should be so much obliged if you would tighten them up a little for me. The others are working very well."