Well, this kind of comes back to the whole idea of RB re-visiting old haunts, and either taking or sending MB to known places where he knew he could contact her. Don't forget the MO of JO (such a gift as regards to his MO, although admittedly not for her) of delivery to a place, and subsequent abandonment. He has well-travelled rat-runs and returns to well-known places, and established connections in all of these places; whether it be for coin-related interests or other 'interests'. He's a creature of habit: re-uses known names, and returns to familiar territories.
It seems from MB's postcards, she stayed in B&B's, but ultimately appears to have had a base from which to do her tours. There's many possibilities, and I don't have the answer, but look first at where he lived before, and who he might've known in the area, from when he lived there in the 1980's. Outside of annoyingly public B&B's at the time, there's lovely private families on oast farms, who he may have known. I can think of at least two connections we've discussed who may fit the bill, there's perhaps a third in convenient Ickelsham, that may not be Manor Farm. He won't be concerned about returning to visit, they know him, and what he's about.
MB for sure was in the area; she posted cards, hard to believe they were contrived in any way, some apparently from after she returned to Australia. At least one appeared to be blank, only addressed. That may speak to:
1.MB oblivious and still in the UK post 2 Aug 1997
2.a sudden departure (of whatever kind) and an accomplice posting
3.a sudden departure (of whatever kind) and someone unconnected finding them and posting
None of the above speaks to a good end, but if we're looking for connections she may have met in the area, the Dutch dentist and Maz are still good places to go.
I Looked it up. 
