https://www.thunderboltmodels.com/
Quote from their website:
Thunderbolt Models is a small UK based web store that buys and sells good quality second hand model railway items.
We stock model railway items in the following scales: "O Scale", "OO Scale", "HO Scale" & "N Scale".
We are always on the lookout for items to purchase so do not hesitate to contact us if you have anything for sale, we offer competitive prices.
Feel free to browse our site and we hope you will find something of interest that you want to purchase.