Hi David
**LINK**
are quick
or if you are buying full sheets Smiths Metals
**LINK**
who have a counter service.
If you are clock making do ensure you buy CZ120 (half hard leaded brass) for wheels and plates.
Cousins Material house and Meadows and Passmore for springs, pivot steel, line, dials, finials etc.
**LINK**
**LINK**
What are you making?
regards Martin