Got email from Paypal saying the following
Be the Batman.
Save Gotham and save yourself £10.
The fate of Gotham rests in your hands, so top up £50 or more in the PlayStation Store with PayPal before 31st July and get £10 off Batman: Arkham Knight.* And don’t worry about roaring down to the shops in the Batmobile. Buy the game by speeding through checkout with PayPal, download it to your PS4 and you’re ready to play.
Get £10 off a £50 purchase on the PlayStation Store.
Simply save this offer in your account and when you pay with PayPal at
checkout your offer will be automatically applied to your purchase.
[Only registered and activated users can see links. ]
Not got PlayStation account and I don't think the offer is directly linked to my paypal so all you PS'ers crack on ;-)