Found - a stamp in the front of a book reading: 'Dear Friend, This book comes to you with every good wish from the people of Leicester. May it help you to spend happily some of your hours off duty. GOOD LUCK. From The City of Leicester.'
It was in a copy of Brahms and Simon's A Bullet in the Ballet (Joseph, London 1937.) This was probably part of a campaign to give off-duty service men and women a free book to read in the latter days of World War 2 - and also to welcome them to towns near their bases. There is slight evidence from online research that this was a British Council initiative. Possibly it was aimed at American troops...
Two books appear in online libraries bearing this stamp. The first is Lord Raglan's The Science of Peace (Methuen, London 1933) with a similarly stamp but from 'Tunton' (probably a misprint for Taunton). This was at the Royal Anthropological Institute. The other was a 'Bacon-wrote-Shakespeare' book that had made its way to the Kirov Order of Honour Universal Regional Scientific Library in Russia. The stamp there is from the Borough of Dagenham. The book was Sir Edwin Duhring-Lawrence's Bacon is Shakespeare (Gay & Hancock, London 1910). Good reading for the war weary soldier...