I have a few of them, all a little different & unique. The smaller more stylized ones appeal to me personally. Depending on what you're looking for, decorative or functional. They are pretty simple, two canisters, top one for water which drips into the lower one holding the carbide pellets. Tube from lower chamber delivers acetylene gas into bezel housing. Other than the obvious, cracked or missing lens, sometimes the canisters have splits or rot holes. Here are a couple, the one on top is a Columbia, the bottom one says British Made. Hope this helps, Moe.
If you search on eBay UK there are usually quite a few for sale; not sure on what import taxes you'd have to pay though, when I get stuff from your side of the pond it can be rather expensive! Fairly common British ones are made by manufacturers such as Lucas or Powell & Hammer.
Is it easy to get hold of the carbide over there? There aren't many retailers here, only mining/caving suppliers.