075011675**
"John"

When I asked "John" for payment, he asked if I take card. In response to my emphatic rebuff, he said he would go and seek a cashpoint. He then duly left, bringing the matter to an end.

UPDATE AT 6-6-18:
He has just tried to call me again (but is of course blocked).
I have since found that he did a "peep-then-pretend-to-go-and-find-a-cashpoint" to someone else about a month before my own encounter with him as shown at https://saafe.info/main/reporting-(persistent)-timewasters-phone-text-pests/look-and-go-wetherby/msg312155/#msg312155