Update: Looks like ShopTo's site is getting hammered for this deal so try going to https://www.shopto.net/en/search/?input_search=ps%20plus and buy it from that page.

Add the item to basket and then use coupon code EXTRATEN before checking out.

You can get it for even less if you are a Silver (£29.50) or Gold (£29.18) ShopTo member.

This 12 month PlayStation Plus membership will allow you to play multi player and single player games online. If one of your friends does not own a game but you do, they can play with you online. 

How will I get my PS PLUS 1 Year UK membership?
Go to my account> Digital Items > click "View Details" tab

*By placing your order, you agree to our Digital T&Cs.
*This product is non-returnable and non-refundable.

How To Redeem Your Subscription

1. Once purchased you can find your code in the Digital Items section of your ShopTo account.
2. On the Digital Items page select the View Details button on the relevant digital item.
3. Wait for the code to be retrieved. DO NOT REFRESH THE PAGE.
4. Once the code has been retrieved follow the relevant instructions to redeem the code:

Browser

1. Go to PlayStation Store and click on your Avatar at the top of the screen.
2. Select Redeem Codes from the drop-down menu.
3. Carefully enter the code and select Redeem.
4. The credit or content is now applied to your account.

PS5

1. Go to Settings > Users and Accounts.
2. Select Account > Payment and Subscriptions > Redeem Codes.
3. Enter the code and select Redeem.

PS4

1. Go to PlayStation Store > scroll to the bottom of the sidebar > Redeem Codes.
2. Carefully enter the code and select Redeem.
3. The credit or content is now applied to your account.