The best-supported answer is that Wetherspoons’ BBQ chicken paninis use Heinz BBQ Sauce. A calorie-and-ingredient listing for the Wetherspoon BBQ Chicken, Bacon & Cheddar Cheese Panini names Heinz BBQ Sauce directly.

There’s also some forum chatter suggesting other possibilities, but that’s not as reliable as the ingredient listing. So if you’re trying to copy the taste at home, Heinz BBQ Sauce is the safest match.

What people are saying

  • One Reddit comment claims it’s “probably from Brakes” and another says “Think it’s a Jack Daniels BBQ sauce!”.
  • A YouTube review mentions the sauce was served in a little pot, but does not identify the brand.
  • The most concrete source I found is the ingredient list naming Heinz BBQ Sauce.

Practical takeaway

If you want a close dupe, start with Heinz BBQ Sauce and adjust with a little extra sweetness or smoke to match the pub-style flavour.

TL;DR: Wetherspoons’ BBQ panini sauce is listed as Heinz BBQ Sauce, despite some forum guesses to the contrary.