How do you install new level packs in Lego Dimensions?

How do I install new level packs in Lego Dimensions?
I just bought the Back to the Future pack and I've built the hoverboard and the DeLorean but I can't work out how to unlock the level.
The title screen tells me there is an update but how do I install it?
I'm on the PS3 version.
Thanks.
Best Answer
You know when you search for an answer to a problem you've been having and you can't find anything and it ends up being something stupid?
This is one of those times.
My ethernet cable was unplugged and when I plugged it in the game ended up needing an update which it prompted me for when I restarted the game.
The content was then unlocked.
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