Last week, a biscuit fan from the Isle of Man was enjoying a luxury M&S biscuit when he made a shocking discovery: what appeared to be a custard cream hiding beneath.
The box of Marks's extremely chocolatey biscuits costs £6, whereas a pack of M&S custard creams is just £1.
But a side-by-side comparison carried out by BuzzFeed showed that they do appear to be made from the same mould as M&S custard creams, as claimed.
The white chocolate cream biscuit also hides a shadowy, custard-cream-shaped surprise once the topping is removed.
However, Marks & Spencer claims there's nothing deceptive going on here.
An M&S spokesperson told BuzzFeed: "Customers can rest assured the biscuits remain our own luxury recipe covered in milk chocolate, they are simply made using the same mould as a custard cream."
Unsatisfied with that explanation, I tried to do a little more digging.
However, Marshall – who uploaded the pic to Instagram – isn’t fully convinced by the official story.
An investigation into the other biscuits included in the pack provided no further evidence of potential biscuit conspiracies.
The only thing left to do was a taste test, conducted under strict laboratory conditions on my desk.
We got five testers to try both a custard cream and a luxury biscuit to find out if they were different – they all agreed they were.
So is the case closed on #biscuitgate? Are the interiors of these luxury biscuits really only moulded like custard creams? Perhaps we'll never know.
