At least the coin shown by Nutloose is an actual legal tender coin worth two quid. The one in the OP's post is technically legal tender on Jersey, but just try spending one there!
The others aren't even coins, but medallions
These things cause coin dealer's hearts to sink when they get brought in for sale, usually when somebody has died. I used to just polite decline, rather than risk offence by offering about 25% of what they had cost in the first place, which quite honestly is the most that the damn things were worth. Westminster is but one of many other outfits flogging this stuff - one rejoicing under the name of The London Mint must sell a lot of coins to people who think they are buying from the Royal Mint - but of course they aren't breaking the law.
What I always say to people considering buying this stuff - who do you think is paying for all this expensive newspaper and TV advertising? The answer of course is - you are!