Playing Devil's Advocate for a moment, in the £80 version you get all this:
If we assume you're paying £40 for the expansion, then the other £40 is for all this other stuff. I think it's perhaps a little disingenuous to say they're making you shell out for the game again, as opposed to saying the game is included on the off-chance someone new to Destiny wants to jump in now and likes Limited Edition tat.
Think about it, if they'd decided to charge £80 for this without the base game and first two expansions, would it seem like that scummy a pack? (for the sake of argument let's say you're ok with paying £40 for the TTK)