You may struggle with B&Q. A lot of their stuff is metric only. You may have to speak to an Engineers Tool Supplier. What are you after? A tap or die, bolts or threaded stock?
It (very much) depends on what you are using it for I have occasionally run a 10m tap down a 3/8 BSF female thread to attach something to my box with a 10m bolt but would not use if it was going to be unscrewed on a regular basis.
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