The latest Sony sale is on for Playstation, called Days of Play. Lots of big discounts on a lot of games, dlc and upgrades.

One of the most useful discounts is 25% off all Playstation Plus subscriptions. So a year's sub for Premium is £75 instead of £100. That's worth it. Someone pointed out you can actually save even more by buying an £80 PS card on G2A.com for £75 to then buy Premium, leaving you with £5 credit.