The village which was a one of the 14 conservation areas of local government district in Hertfordshire was also mentioned in which book? 
Aldenham: Aldenham is a village and civil parish in Hertfordshire, 3.5 mi north-east of Watford and 2 mi southwest of Radlett. Aldenham:  It was mentioned in the Domesday Book and is one of Hertsmere's 14 conservation areas.
i don't know