As per title, so long as it's not interest based investment, what would you do with 50 to 60k?
That is easy for me to answer - I would split the sum into two packages -
1. About 12 gold one-ounce Britanias. Put them to one side and forget them for a few years. If/when you sell them, any nominal profit is tax-free.
2. The rest in junior miners in sensible jurisdictions that have proven deposits of key precious metals that have yet to be exploited. These usually go for pennies, despite the deposits being proven. I am watching one now that has 7 million ounces of PROVEN gold deposits in the ground (making it the fifth largest proven deposit in North America), is fully permitted, roads, rain, and utilities are installed, etc., and is at $0.36 Canadian. I would also look at precious metals royalties companies.
When buying share, particularly in something as risky and speculative as gold and silver miners, ALWAYS loo at who your fellow investors are going to be and when the insider trades are doing. You are looking for big names with proven track records in that field who are risking their own personal wealth.
Do not buy and sell shares via a UK bank or broker.
Also, remember that silver is an industrial metal and vital to the defense industry, as well as for electrics and electronics.
Humanity has totally under-invested in developing new sources of precious metals and without them, we do not have a modern technological society. Every intercontinental ballistic missile needs about 1kg of silver. So if we want to kill one another at scale, we must find new silver deposits!