Re: We are considered pretty trustworthy globally ...
"which is standard operating procedure when it's unclear who should be entitled to them"
You're right that it's SOP against countries that are too weak to fight back. It's the new face of piracy, except that it has been practiced for decades. It's also perfectly clear who should be entitled to them - but a bunch of rogue countries decided otherwise and anointed a practically nobody as the "next president" of Venezuela.
"Since Maduro is not recognised by the UK (and other EU governments)"
At least you got it right by using "and other EU governments" and not "and the EU". Italy was the only major EU country with the balls to stand up against this blatant aggression against another country and prevented the EU from making a joint statement.
Note what happened when the Italian deputy PM met with some representatives from the Yellow Vests - France called it "an unacceptable provocation" and recalled their ambassador to Italy for "consultations".
But somehow it's perfectly fine for a bunch of Western countries to dictate to Venezuela who their president should be and to urge their people and their military to overthrow the incumbent government. And then they have the cheek to call this "returning Venezuela to democracy".
For the record, Venezuela has one of the most transparent election process in the world (yes, really - do some research). Stakeholders are present at all stages of an election to monitor and verify. All voting machines give out receipts and maintain a hardcopy paper trail (which are tallied and checked against the electronic results) - unlike some countries where although machines are required to keep hardcopies they "mysteriously" end up with no paper loaded on voting day.
"When Venezuela gets its government sorted out, then that government will have access to the money again."
There is no sorting out needed, the sole legitimate government is the one recognised by the vast majority of countries and the UNGA.
Hopefully the decision by Russia and China to send have their militaries pay a visit to Venezuela will be enough to signal to the would-be regime-changers that military options are not on the table.