Top up your PlayStation Store wallet with £100 or more before the end of the day on March 8 and you'll receive an extra £15 to spend in the store.
The Top-Up promotion begins today, so top-ups made before today will not count.
1. Top up your wallet using any available payment method you like.
2. Sony will send you a message via your PS4 after 9th March 2016 with a voucher code.
3. Redeem that voucher code on PlayStation Store to get your wallet top up.
You will have until March 27 to redeem your voucher.
It's also worth pointing out that the £100 doesn't have to be in one top-up, with the accumulative total from today until March 8 needing to be £100 or more.
You'll find the full terms here.
With No Man's Sky pre-orders expected to open tomorrow, now could be a good time to top-up to earn that extra £15.
Source: PS Blog