Good news! My garden is not overflowing with my neighbours pots and plants.
They were repositioned so as not to be in the new occupant's way. It helps considerably that the "new" person is the sister of the people who live between me and the new person.
It occurred to me that as the new house of the old occupants is not completely built yet,
it could be considerably longer than planned before the plants follow them into their new home. The reason she wanted to take them with her was that many of them are of sentimental value, as they were gifts from dear friends, some sadly now departed.
Much as I like my garden, none of them are of sentimental value. Even the one in memory of my Mother, an apricot rose named "Honey" is replaceable. She liked apricot as a colour and honey with her toast.