Paul,
Thank you so much for this very interesting, fascinating and entertaining thread. Hotpoint automatic's were quite rare in our neighbourhood when I was growing up. A primary school friend had the 1509/10 top loader and my mum's best friend had the 1828/02. My sisters primary school friend had a 1600 in her house though unfortunately I never got to see it in action. I think it was the later 1830 model as I am pretty sure it had a stainless steel drum.
I inherited a 1701 dryer when I moved into a flat in Aberdeen. that was in 1992 and I had it up until I moved to Edinburgh in 1999 and it was still going strong. I have quite a soft spot for Hotpoint machines as the design was quite unlike other automatics, self explanatory simple to use controls that felt solid and well built.
Thank you again for this wonderful thread.