What it is, is both products come in a cellophane wrapping which the purchaser must open to get at the product. The McVitie's wrapping is easy to open , no problem whatsoever. The Warbuton's wrapping requires industrial cutting tools to get into. If you try using yor bare hands you don't stand a chance and will end up destroying the crumpets inside , reducing them to untoastable crumbs as you get more and more annoyed at the fact you can't actually open the damned packet.
If you are going to buy a product and see that the packaging is damaged , put it back and get another one. Too many products are almost impossible to get into without some cutting implement , which in itself is dangerous. Imagine turning up at casualty - "I stabbed myself trying to open a packet of crumpets then burnt my hand when I got its stuck in the toaster"!