Usually, eBay offers discounts for items from select sellers only. Today eBay UK is casting a wider net - 10% off anything you buy. The promo will run until later today at 20:00 local time. You are limited to two redemptions, but you could use the discount code PICKANY even if you have items from multiple sellers in your cart. You need to spend at least £20 and can get up to £50 in discounts. There are some other conditions, e.g. you need to be a registered eBay UK user, pay with PayPal, credit or debit card and a few others. The most important detail is that you can't stack the 10% off...
Source: https://www.gsmarena.com/deals_10_off_anything_from_ebay_uk-news-32582.php