Izabella The Arts Council say on their page about the exhibition that "the new acquisitions are on a grand tour of the UK until summer 2019." They don't seem to have any more detail than that.
We hadn't time to visit this today, but the last day is next Monday, 30th September. I and GeminiJen plan to catch it. anyone else interested? Open 10.00 am to 17.00 pm