Mensa UK Are Stupid and Unobservant!

Bold statement, can I back it up?  Yes.  Each week Mensa publish their free puzzle and it's usually not too difficult.  The number-based one usually take a few seconds, the word-based ones a little bit longer (and vice versa for a former colleague of mine who shall remain Charlie, I mean nameless).  So let's take a look at this week's puzzle...
"You have £5.84 in change and it's made up of four different denominations of coins, the largest being 50p. You have exactly the same number of each coin.  Which coins do you have and how many of each coin?"
Now you may think that's a good puzzle, it should keep you going for a little bit.  That's true.  The answer will apparently be revealed next week (29th), also fine.  I want to know why they decided to put some stock images of British coins to brighten up the web page...?