My guess would be that it will be a 1/2 NPT close pipe nipple with hex wrenching feature. We were never big on BSP over on this side of the pond. You can pick up the pipe nipple at the same place you can find that cap; any decent hydraulics supply shop will have it. Bring the photo with you. Possibly even princess auto in their hydraulics section, but I can't say for sure on the breather cap. Make sure you get a steel and not a brass fitting. They will cost about the same, but the steel will be a lot stronger.
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