This was the eighth novel by Gaskell that I've read. Sadly, it was also her last. (I can't discover a death date for her, so it is possible she could produce another, although she would now be in her eighties; we can always hope.) Published in 1990, after a hiatus of 13 years, in which she published only one piece of short fiction ("Caves", 1984, which seems to be the opening chapter of an unpublished, pornographic fantasy novel rather than a short story), Sun Bubble is the tale of a forty-something journalist's love affair with a much younger alcoholic ne'er-do-well, with predictable results. Her life is complicated, however, so there are various sub-plots, including: 1) Her struggle with her teenaged runaway, druggie daughter; 2) Her struggle with unscrupulous builders who eventually ruin her home; 3) Her struggle to fend off a wealthy suitor who apparently could solve all her problems... And so on. All of which is handled brilliantly, in Gaskell's inimitable style. There are no speculative elements, except in the final chapter, wherein the cynical journalist attempts to contact her dead lover via paranormal means. If you've enjoyed other of Gaskell's realistic novels, you would probably like this one, as well.
PS--Print editions of this novel may be hard to find, but it can be read in its entirety on Archive.org.