Hi-Spec 39pc Imperial SAE & Metric Tap & Die Set. Complete M3 to M12 / #4 to 1/2in Tapping and Threading Tools with Tap Wrench & Screw Pitch Gauge Accessories : Amazon.co.uk:
Metric Fine Thread Data - Newman Tools
M3~M20 HSS High Speed Steel Anti-Thread Tap Left Hand Fine Thread Machine tap | eBay