Here’s a list of some leading suppliers of rhodium metal powder in the United Kingdom:

```markdown

Leading Suppliers of Rhodium Metal Powder in the UK

1. Johnson Matthey

   • Specializes in precious metals and offers a variety of metal powders, including rhodium.

2. Goodfellow

   • Provides high-purity metals and offers rhodium in various forms, including powder.

3. Chase Metals Ltd.

   • A distributor of precious metals and provides rhodium among its various offerings.

4. Metalysis

   • Innovates in the field of metal powder production and might provide rhodium products.

5. Cameco Metals

   • Supplies a range of metals and metal powders, including rare and precious metals.

6. Alfa Aesar (part of Thermo Fisher Scientific)

   • Offers a wide range of chemical and metal products, including rhodium powder.

7. Heraeus Precious Metals

   • A global company with operations in the UK providing various precious metal products.

8. Noble Metal Services

   • Specializes in the supply of precious metals, including rhodium and its derivatives. ```

Please verify the specific offerings of each company, as product availability may vary.