bit of background first - the house is 2 doors from me and before i moved here a lady who was a keen gardener passed away and various itinerants have moved in for short periods of time and once a year the landlord sends someone round to cut the undergrowth back.
my neighbour pointed this plant out to me and said that he had never seen it flower in the 5 years he has lived there.
the photo does not do it justice as i took it late this evening.