I was planning a quick Amazon Prime Day round-up tomorrow, but this deal is unlikely to survive until then.
Via this link, you will receive a bonus £7 credit when you top up your Amazon account by £50.
This offer is limited to Amazon Prime members only, given that it is Prime Day, and to the first 60,000 people to use it.
You need to register before buying your top-up, so you will know if you are inside the first 60,000 people or not.
It worked fine for me a few minutes ago:
….. and of course you can spend the credit immediately.
The extra £7 seems to appear around 10 minutes after the initial £50 so don’t panic if only £50 appears at first.