This is very enlightening as I was approached yesterday as I left the house by a man selling teak garden furniture with the same patter, from Oxfordshire though.   Said he had left-over stock from Horniman's Garden and was delivering nearby to members of National Trust.   The psychology seems to be mentioning well known establishments to create feeling of trust.   Had a nice van with company logo, was wearing uniform.   Well it worked and I bought some - a Lutyens style bench and a table and chairs.   Gave me a receipt and the address does exist but a private house rather than garden centre.   Not sure if I've been conned - I did need them actually and they do seem good quality.   With teak prices seem to vary wildly so not sure if I overpaid.    Said he was heading over to Court Lane Gardens next.   Any more sightings???