Check out the EU PSN website for the big name sale that kind of makes up for no Vita games being in the 12 days deals. Persona 4 is a mere £3.99 and Freedom Wars is £7, if you don't already own them, or are getting a Vita for Christmas.
Most big games have at least £10 off and up to 2/3rds off in some cases. Zero Time Dilemma is £18, Dancing all Night £12, Steins Gate 0 is £20 etc etc. SuperBeat Xonic is a bargain at £11 while at the budget end, Titan Souls, Last Blade 2 and Bastion are under £4 each.