The Casino is definitely post 1990 refit, I was part of the refit team and then stayed on as Slot tech through the 91 world cruise.
Casino was completely re-decorated, previously having Tan carpeting, Green walls and black ceilings...looked awful!
The new decor was a wood grain laminate on the walls, plush blue carpet and lighter ceilings.
The architect Graham Fahye wanted an art deco theme similar to the Queen Mary, there were gold art deco motifs
painted on the walls and heavy over stuffed sofas!
The old Bally slot machines were replaced with IGT electronic machines, way more reliable. The old Bally's ended up on
the ex RFA Sir Lancelot running as the Lowland Lancer Casino boat in Capetown SA.
Gaming tables and chairs were all replaced and a Craps table added.
I remember that the Casino bar was relocated into our old Staff rest area as a Bar service room. The staff rest area was moved into the areas behind the Theater where the interpreters booths were.
The attached photo posted before shows the result of a couple of heavy rolls leaving Southampton on the first post refit cruise....oops!