Having had the time to go through the contents the prices do not add up.
Here is the breakdown.
£6.75 Captain Scarlett and Her Pirate’s Booty
£6.75 Mr. Torgue’s Campaign of Carnage
£6.75 Sir Hammerlock’s Big Game Hunt
£6.75 Tiny Tina’s Assault on Dragon Keep
£6.75 Gaige the Mechromancer
£6.75 Krieg the Psycho
£3.39 The Ultimate Vault Hunter Upgrade Pack
£3.39 Creature Slaughter Dome
£3.39 Collector’s Edition Pack
Total = £50.67
That makes the total short of £24.33. I could not find the UK version but the US(?) one has a similar claim of $100 of content (see image)
When I bought it off Amazon (new) the description was as follows:
Borderlands 2 furthers the distinct blending of First Person Shooter and Role Playing genres to create the true evolution of the Role Playing Shooter. Team up with up to three other players for four-player online goodness or go old-school with two-player split-screen couch sharing mayhem as you spend hours leveling up your character and equipping them with one of the millions of badass weapons.Borderlands 2 features a new visually stunning array of procedurally generated guns, shields, grenades, artefacts, enemies and more. With the Borderlands 2 Game of the Year Edition, players can experience every epic boss battle, increase the level for each of the six playable Vault Hunters, play all of the additional campaign content, and enjoy hundreds of hours of shoot-and-loot mayhem at an extraordinary value.
play all of the additional campaign content Which is not the case, on a rough guess I would say I am missing near half of what is available.
A quick summing up of the other content would be much nearer the missing £24.33.
If the game was not so good I would have returned it as the product description is not what you get.