A look at the site using Multimap's Birds Eye View for BS16 1ZS is educational.
It would appear that the pilot chose not to land where there was a stack of open space on the south side of the house, but in a tiny confined area on the north side. Definitely a congested area - and definitely causing way more nuisance than if he had chosen south side. Using Google Earth, it seems likely that he had less than 200m to lift with 4 POB in a JetRanger surrounded by housing.
Utter madness.