Games to get in the last hour? Budget £12.

Dishonored is a good game!

Torchlight is pretty good

I'd say don't get NS2 or RAGE

Torchlight 2 or Rage, both great games :-)

KoTOR 1 & 2 are great games, so both if you can afford it and don't already have them.

I really enjoy Dishonored, Omerta and Torchlight 2. But all of them have diferent styles.
See wich fits you better and buy it.
In my opinion, I would get Torchlight 2 since it has more playtime then all the others, and a greater replay value, since it has random field generation.

Omerta is bullshit, please don't buy it.

Shogun 2 TW/FOTS, FTL, To the moon

Dishonored is the best from your list.

rabble rabble rabble!