On 18/02/2017 09:00, Martin Brown wrote:
On 17/02/2017 18:16, Nick Maclaren wrote:

Does anyone know of a source of these?

No. What is their claim to fame? Salford in Lancashire seems an unlikely
place to grow runner beans so which Salford is it?

Google tells me that it comes from the village of Salford in the
Cotswolds. Google also tells me that the name is a reference to the
polluted nature of the Lancashire Salford.

--
SRH