Well, you learn summat new everyday on here!
I do admit I had never heard the crown (coin) called a "dollar", nor ever read it called that, so it can't have that universal.
What I do recall of "going decimal" was the instant rip-off where shopkeepers simply replaced the "d" with "p", multiplying the cost of small items by 2.4.
Also, most people soon stopped using the word "penny" (except – given the topics above – to "spend" one) and called it "pence" even in the singular. The "new" prefix faded away as we became accustomed to it.
The "guinea" is still used in livestock auctions, it would seem – apparently as an old tradition that gave the extra "bob" to the auctioneer, though of course the "New Guinea" when not an island is one-pound-and-five-nuppence.
I think I can still remember how to carry out Compound Arithmetic for proper measurements and currency; to calculate the cost of, say 3cwt 2qrs of coal at £17/6 a ton (or however much it was in the early-1960s when I was taught the method). Note the careful use of taught in that last clause – but don't ask me if it's an object or subject clause 'cos I forget how to identify them!
++++
One set of my grandparents lived in a Victorian terraced estate – for them as know Nottingham, Hyson Green as was – but theirs was among the better ones, with a tiny front yard between pavement and front door. The loo was a proper w.c. but in a brick outhouse (!) just beyond the back gate of a small yard that gave enough room to grow a few plants. Since the khasis were in a path serving several homes, reached by a passage though the terrace, it's possible they were earth closets when first built.
T'other grandparents were grander, as their 1920s-30s semi over in Arnold had an indoor w.c.. It was in a small lobby between the back door and the fair-sized kitchen / living-room – well-appointed with both a range and one of these new-fangled gas-stoves. Front room? Oh yes, but one keeps one's front room for best, and I never discovered when "best" was! (In the Hyson Green home the front room was equally for best but also the route from front door past the cellar door to the back room – I forget what we called the latter, parlour I think – stairs and scullery.
A native of Leeds told me his parents' first home was in a similar terrace with brick outhouse, but instead of a chain to pull the loo was flushed by a "flop-jack" – a device borrowed from old-time metal-ore mining, comprising a small tank on bearings, filled with water until it over-balanced and sent several gallons of water drain-wards in a rush. The flop-jack, below the loo floor, was filled from the roof down-spout. Consequently, he explained, in hot dry weather the whiff of drains was noticeable; while in very wet weather the foul miasmas were replaced by continual crashing, splashing and rushing noises as a dozens of flop-jacks discharged all out of synch with each other, and banged back down on their rests. (I don't know if the scullery sink also drained to the flop-jack.)
+++
Just looked back to see what we had been talking about. The Unique test-indicator. Oh yes!
Well, Nottingham was an industrial town so no doubt the Unique was by no means unique there. I do not know when it was invented, but if far back enough my Grandad Kay, the Arnold one, might have been familiar with it. He was a lace-designer; meaning he designed not the art-work itself but the lace-looms' cams and control mechanisms that generated the patterns. A previous Kay established himself as cycle-manufacturer under his name in the city, so may well have used if not the Unique then perhaps something like it!
I have just looked… yes, though I forget how I came by it, mine is indeed a Unique !