Lewes and Alfreston?
I think I recognise the park (the one with the red house) as being in Lewes in East Sussex, but I'm wondering if the long street is nearby Alfreston?
shareWiltshire I think:
http://www.radiotimes.com/news/2014-09-14/the-top-five-mr-whicher-locations-you-can-visit
It's too cerebral! We're trying to make a movie here, not a film!