Leading Suppliers Nationally for Superconducting Magnets

Sure, here is a list of leading national suppliers of Superconducting Magnets in the United Kingdom:

1. TESLA Engineering Ltd.

2. Oxford Instruments plc

3. Cryogenic Limited

4. Magnetic Shields Limited

Please note that the landscape may change, so it would be advisable to conduct further research for the most up-to-date information.