Here goes...
Government created currency is supposedly inherently worthless, at least since it ceased to be linked to the value of gold. But gold is not intrinsically valuable, it is more like a sophisticated form of barter. So, spending £s created by government only has a value in the context of supply and demand.
Taxation of £x of spending occurs over a very long period of time as the net spend reduces with each act of taxation. So very slow catch up.
Ultimately a fiat-based currency is only as successful as the faith people put in it, and they will quickly lose faith if it shows signs of not working, such as hyperinflation.
Like religion, whether God objectively exists or not, He exists if enough people believe in him, and act on that faith. But when doubts arise, or the orthodoxy is challenged, all hell breaks loose.
Blup
Yeah, fiat money is not commodity-based so it's not convertible to anything (gold, silver etc.) Obviously the £ is a fiat currency which is controlled by the UK government.
People are free to use whatever means of exchange they like but, ultimately, if you live in the UK you will have to use £s. Why?
Because the £ is the generally accepted unit of account, means of exchange and store of value in the UK and, crucially,
all taxes have to be paid in £s.
So, as long as the UK govt imposes taxes (and it always will) the £ will be in use and have 'value'.
Taxation occurs over a long period? Not really. Taxation is anything that reduces demand.
A simple example:
. I spend £100 in Tesco
. Depending on what I've bought, some of that £100 may attract VAT
. Tesco use some of that £100 to pay their staff
. The staff pay income tax/NI on their salary
. The staff then spend their salary etc. and round it goes
. Every stage attracts taxation
There's also stuff like capital gains, stamp duty, inheritance tax, tv licence, fines etc and pretty much any other charges govt levy.
Hyperinflation: Yeah, it's never 'printing money' on it's own that causes currency collapse. That's a simplistic & reductive narrative. There's always some or all of the following:
. Production collapse
. Political instability/corruption
. Continued deficit spending