Grantanow
That's a good question MaizieD! Although sovereign central Bank's like the B of E can print more fiat currency like the Pound (QE, as they call it nowadays) - using the printed money to buy Treasury bonds so the Treasury receives the money to inject into the economy as you mention happened in 2008 - the problem with any fiat currency is that it has no guarantee as to its value beyond the good faith and credit of the issuer, that is, the Bank's and ultimately the government's word as to its value. Simply printing more and more would unsettle the UK's creditors internationally. If a fiat currency were to fail then the Bank has gold reserves with which to repay international lenders. In 2019 the Dutch central bank said that a gold reserve is the 'collateral' which enables starting again in the event of such a collapse. The USA holds 8,000 tonnes of gold as such a reserve. Other countries hold smaller but significant amounts: China, Russia, France, Italy and German each hold about 2 to 3 thousand tonnes each. The UK holds about 300 tonnes. To be fair this line of argument is not universally accepted but the central banks clearly regard it prudent to hold gold reserves.
Grantanow from what I have read, our currency is no longer related to gold. Indeed, no country has used the gold standard since 2013; we left the gold standard in 1931.
International currency is, and has been for some time, based on the dollar, not gold. The view of how we compare to the dollar and other currencies relies on the strength of a country's economy (heaven help us).
Yes, other countries have been "prudent", as you suggest, but then so was Brown.
As you say, the argument you put forward is interesting, although not accepted by many. However, we should always know the balancing ideas. The comment that "Brown sold off the gold" is the sort of dark ages type that comes from bias and the reading of news comics, not facts.