Greeniejim, don't confuse the "London Mint Office" with anything to do with the actual
Royal Mint. As Anaximander said, the "London Mint Office" isn't a mint at all, royal or otherwise; it's a coin mass-marketing company.
Kena has also highlighted the primary goal of such "deals": to get you on their mailing list, so they can send you one random bullion-grade coin of their choosing a month and charge you £50 each for them unless you manage to get them to stop.
Quote:
...making false claims "SOLID SILVER" 4 times on the page until you get to the coin spec in small lettering at the bottom of the page.
It's not, legally speaking, a false claim. These kinds of companies are usually pretty good at avoiding outright lies they could face court over. "Solid silver", as far as I know, has no particular legal definition, unlike words such as "sterling" or "pure". A .500 fine coin is not hollow or silver-plated, so legally, it probably counts as "solid".
Weasel words, though, they certainly are.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis