My partner and I have been doing this recently. Even though many people arrive early, we still tend to find items that sell well — vintage toys, electronics, clothing, even the occasional collectible — and it’s been a good way to build a side income alongside our regular jobs.

I’d recommend using Google Lens to identify items. You can also use the CEX app for checking game prices (I personally avoid doing this in front of sellers as it feels a bit disrespectful), and the built‑in photo tools on eBay or Vinted can help too.

Google Lens is definitely the most useful. I rarely scan items openly when I’m there; instead, I look at something and think, “Okay, this is £2 — on Vinted or eBay second‑hand it should sell for around £X.” Scanning right in front of the seller can come across as disrespectful, so I try to be discreet.

At the end of the day, everyone benefits: the seller gets money for something they no longer need, you get an item you can resell for a profit, and the buyer gets it for much cheaper than buying brand new. All parties win.

A good example is a Buzz Lightyear toy my partner picked up for £2. You don’t even need to check recent sold listings to know it will sell for a profit — sometimes a bit of logical thinking is enough. But it’s still usually best to check past sold prices and see how much people currently have similar items listed for.