Posted 29th Nov
This deal is expired. Here are some options that might interest you:

£4 to spend on any app or game £20+ - Selected users only at Google Play
You may need to check the Google Play app (Android) and scroll through the Apps tab (not Games)
Selected users only
Terms and conditions:
Valid for a £4 credit against an app, game, or in-game item with an on-store price greater than or equal to £20 at the time the purchase is made from any app or game on Google Play (in-app subscriptions are excluded). Open to select participants based on purchase history. Offer ends 2 December 2019. Credit applied at checkout. Credit expires 15 days after redemption. Limit 1 per Google account. Valid in United Kingdom only. Google Payments account required. Age restrictions apply. See Google Content Promotion Terms and Google Play Terms for more information. Promoter: Google Commerce Ltd, 70 Sir John Rogerson’s Quay, Dublin 2, Ireland
I struggle to find owt worth more have a couple of quid...
Yes
It can be used as an in-app purchase, so can be used for V-Bucks. How sad is that?
I don't think it can be used for V-bucks because Fortnite is not available on Google Play. Even if it was, it would not be "sad" if someone chose to use the discount on V-Bucks. I myself hate Fortnite but I don't have anything against people liking the game and spending money on it...
Agh! Yes, I don't know how I forgot that it's not available on the Google Play Store. Of course. So long since I installed it. Doh!
I went to app tab and then had to scroll down about 10 pages worth to find it, wasn't even listed under black Friday offers.