In a few towns in the United Kingdom, the curfew bell is still rung as a continuation of the medieval tradition where the bell used to be rung from the parish church to guide travelers safely towards a town or village as darkness fell, or when bad weather made it difficult to follow trackways and for the villagers to extinguish their lights and fires as a safety measure to combat accidental fires. Until 1100 it was against the law to burn any lights after the ringing of the curfew bell. In Morpeth, the curfew is rung each night at 8pm from Morpeth Clock Tower. In Chertsey, it is rung at 8pm, from Michaelmas to Lady Day. A short story concerning the Chertsey curfew, set in 1471, and entitled "Blanche Heriot. A legend of old Chertsey Church" was published by Albert Richard Smith in 1843, and formed a basis for the poem "Curfew Must Not Ring Tonight". At Castleton in the Peak District, the curfew is rung from Michaelmas to Shrove Tuesday. At Wallingford in Oxfordshire, the curfew bell continues to be rung at 9pm rather than 8pm which is a one-hour extension granted by William The Conqueror as the Lord of the town was a Norman sympathiser. However, none of these curfew bells serves its original function.