Can you help me find a hippy/boho shop in the UK that stocks a specific brand?

Ok, this is a desperate attempt to find a shop that stocks a brand of clothing called Gekko. I was in Glastonbury today and found a black jacket by Gekko that I just adored. Problem is, I need it in a large and they didn't have it in my size. I thought I might be able to find it online, but no luck and TBH, I'm pretty good at finding things online...

The Gekko online shop doesn't have it, not online, not on eBay, Amazon or Etsy. I can't even find a pick of this jacket to share (so should have taken a photo!! 😭) but I'm willing to do the legwork if anyone knows a shop that stocks this brand. It's very much a hippy/Boho brand so would be in a shop like that.

For ref, it's a knee length, thick, long sleeved black jacket with flared wrists, buttons down the fronts, an embroidered section at the top of the back and a lace up back below.

This is a weird request, and probably impossible, but I REALLY loved that coat 😭