I don't know if it is still like it but the brickworks south of Bedford used to give off horrible sulphurous fumes. It was only when you left the area you realised how bad the air around there was. When gliding from Cranfield it was quite common to see cars stopped on the M1 near there as the the source of the burning smell was investigated.
Certainly not aware of any smell in the air yesterday around Shobdon or Oaksey Park.