Here is a list of leading national suppliers of cobalt drill bit dispensers in the United Kingdom:

```markdown

Leading National Suppliers of Cobalt Drill Bit Dispensers in the UK

1. Screwfix

   • Website: screwfix.com

2. Toolstation

   • Website: toolstation.com

3. Travis Perkins

   • Website: travisperkins.co.uk

4. Wickes

   • Website: wickes.co.uk

5. B&Q

   • Website: diy.com

6. Cromwell Tools

   • Website: cromwell.co.uk

7. R.S. Components

   • Website: rs-online.com

8. Amazon UK

   • Website: amazon.co.uk

9. Brammer Buck & Hickman

   • Website: brammerbuckhickman.com

10. Machinery & Engineering Supplies

    • Website: machineryandequipment.com ```

This list combines major retailers, tool suppliers, and components distributors that offer cobalt drill bit dispensers. Please verify the availability of specific products on their websites, as inventory can change.