Cider, bulls and a beautifully restored cathedral which hosts the annual Three Choirs Festival are probably the key elements used to brand Hereford. But for 20 years, the city has also been home to the UK’s first photography festival. This month, its anniversary is being celebrated in several venues with the focus on Twenty, an exhibition at the charmingly old-fashioned Museum and Gallery where 20 significant photographers share wall space with a gigantic stuffed pike.