I'm a longtime fan of this machine...
I only wish my family bought this machine at the time!
Superelectronic is right I think, the model number coincides with the year 1991 (9565 was the 1990 model I think, which would have been the first model range with the flush door), and the Aquarius wash system came into place the following year. The link below shows the advert for the first Aquarius washing machines and is from 1992.
I think I need this confirmed, but Hotpoint washing machines prior to 1992 (pre-Aquarius) had half load buttons, including the 9566. However later models (i.e. the 9567) had a rinse button, on Microprofiles you could vary the rinses and standard models had a Super rinse button. As part of the Aquarius wash system the load was sensed rather than needing the rinse hold button. As for Ultima branding, that came I think in 1994 with the first WM models (Aquarius Ultima, then Ultima on its own). Below is a picture of a 9567 which was recently on eBay, but was faulty and no one bid on it unfortunately.
I should really call myself 'Microprofilefan' as I'm more of a fan of the Microprofile Ultima models, up until the last WM43 model, my interest waned when we came to the WM71 series, still great but not as great as these models (I didn't agree with the seperate buttons for the wash programmes, and the making a 1000rpm model as we were used to Ultimas having the fastest speeds of the range).
