Several UK retailers offer high-quality men's thick black socks. Here are a few options to consider:
1. **Amazon UK**: They have a wide range of brands and customer reviews to help guide your choice.
2. **Marks & Spencer**: Known for their quality clothing, they offer thick socks that are warm and durable.
3. **John Lewis**: They carry various brands, including their own, and focus on high-quality fabrics.
4. **Big & Tall**: If you are