This thread is being more interesting than I expected. Thanks everyone.

Wouldn't you know it, Wikipedia has Slang terms for money
And it tells us:
Ready money (i.e. available cash) has for centuries been referred to in the United Kingdom as "rhino"; Brewer equates this term with "paying through the nose", rhino- being a Greek prefix referring to the nose, that is, paying in cash.
Given no one has mentioned it so far, certainly not very often. My first reaction was that this must be a wikipedia joke. But it is in bona fide dictionaries I see, with references back to 1670. And one google ref says in Victorian times it referred to the proceeds of a robbery, but I have not found the word in Conan Doyle or Dickens to my recollection. The purported etymology from Greek rhinos, nose, via paying through the nose, seems far-fetched.
Not related to money, but to its lack, and offered so that anillos may have a more complete vocabulary of English at his disposal:
You hear that someone is shopping for a new car, a house, or some other expensive item, but to your knowledge that person can't afford it. You might ask "What business does he have looking at new cars? He doesn't have a pot to piss in."
Edited by NorthAmerican.
Slang terms for money in UK English are many....
Dosh, wedge, ackers, filthy lucre, greenback (pound note - no longer in circulation), minted (lots of money), stash, a few bob (refers to a few shillings, but still used nowadays for a bit of money).
Threepence was pronounced thrupnce.
An old pound was 20 shillings, often written as 20/-
It was 240 old pennies. New pennies are p's old pennies were d's.
Never understood why hardly any (none?) of the 'old' slang words in UK continued after decimalisation (1971, I think). Why no tuppence? (Because nothing costs tuppence anymore??)
There used to be a 10 shilling note, hence the jibe, 'He's as bent as a nine bob note.' (Forgot to say, a 'bob' was a shilling.)
Have we mentioned a 'quid' for a pound? That does seem to have continued pre and post decimalisation. But are there any words for 50p? 20p? 10p? 5p?
What a dull lot we've become.
Wasn't the new 1pound once coin dubbed a Thatcher? 'Thick, brassy and thinks it's a sovereign'?
Don't think the name stuck.

#45--
Because after decimalization the old coins continued in circulation for a while. Tuppence couldn't be used to mean 2p when there were 1d coins in circulation.
I'm a little surprised that "shilling" didn't continue in use to mean a 5p piece, which is identical in size, weight, and value (relative to the pound) of the old shilling.
Vinny, ref two systems co-existing. I never thought of that (actually, I'd forgotten) and it's probably the explanation as you say.
And yes, ref the shilling. You'd have expected some of the older folks (I was 12 at the time of decimalisation) to have continued to use 'bobs' or 'shillings', almost in protest as the change wasn't universally popular. Ah well.
BTW, I've just read my previos post ref 'As bent as a nine bob note,' and suddenly realised that 'bent' has come to mean homosexual in modern parlance. When we used this phrase (back in primary school), 'bent' meant dishonest.
I apologise if the word is offensive to anyone, none was intended.
(Well, that excludes any burglars or con-artists out there.)

The American equivalent of that is or was "as queer as a three-dollar bill." "queer" there has a always meant homosexual, though.
I think it was 'bent as a two bob watch' here. Although I'm thinking ten bob too.
That watch was definitely bent though.

Tuppence couldn't be used to mean 2p when there were 1d coins in circulation.
And, as I said above, people got into the habit of saying "two pee" (yuck), so it no longer occurred to them to say pence.
I'm a little surprised that "shilling" didn't continue in use to mean a 5p piece
It is surprising, (though no doubt to the relief of foreigners) especially considering the traders (the "metric martyrs") who insisted upon violating legislation in relation to the use of other metric weights and measures. It really isn't so hard to comply: you can advertise a price per pound, provided you additionally give a price per kg, have scales that measure in metric, and weigh out 454g when someone asks for a pound.
Though one still does occasionally come across prices in guineas - for example it is not uncommon to price balls (posh parties) in guineas.
The silliest bit of measures legislation we have, considering that most weights and measures must be metric, is the one that makes it illegal for a road signpost to give a road distance or speed limit in metric, even as an alternative to the required imperial measure.
So we are required to buy our fuel in litres and measure road distance in miles, but when did you ever see fuel consumption given in miles per litre?
Before metrication, apparently one measure of the thermal conductivity of walls in Britain was
BTU/hour/sq ft/cm/F
Presumably this is because insulating materials were commonly sold in cm thicknesses.