Sorry, Sipowicz, don't quite understand.
'Happy Valley' is set in Calderdale, of which the chief town and administrative centre is Halifax. I once worked there, under the Halifax Education Authority(later the Calderdale Education Authority). Sowerby Bridge, in which the centre of 'Happy Valley' is set (about 2 miles from Halifax) is at the start of the narrowing Calder valley towards Todmorden - where the land changes and roads go towards Rochdale (left) or Burnley (right). It is an area in the Pennines which is very much controlled by geography.
Hope this helps.