Here’s a list of some leading national suppliers of American Standard Manganese Bronze Pipes in the United Kingdom:

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Leading Suppliers of American Standard Manganese Bronze Pipes in the UK

1. BSS Group

   • Website: bssgroup.com
   • Notable for: A vast distribution network and extensive range of plumbing and heating products.

2. Wolseley UK

   • Website: wolseley.co.uk
   • Notable for: A leading supplier in the UK for plumbing and heating materials.

3. Metal Supplies Ltd

   • Website: metalsupplies.com
   • Notable for: A wide range of metal products including pipes and fittings.

4. Rotherham Metals

   • Website: rotherhammetals.com
   • Notable for: Specializes in a variety of metals including bronze fittings and pipes.

5. BUY BRONZE

   • Website: buybronze.com
   • Notable for: Specializes in bronze and brass products, including pipes.

6. Avon Metals Limited

   • Website: avonmetals.com
   • Notable for: Supplier of non-ferrous metals, including Manganese Bronze.

7. Bronze Bushing Company

   • Website: bronzebushing.com
   • Notable for: Focused on precision manufacturing of bronze bushings and pipes.

8. Cox Metals

   • Website: coxmetals.co.uk
   • Notable for: A reputable supplier of metal products across various sectors. ```

For the most accurate and current information, it's advisable to contact these companies directly or check their websites for product availability, specifications, and other details.