Threaded BB cup removal?

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I’m renovating an old bike, Speedwell GTS and want to take the good parts from a Speedwll Ladies Sport. The BB is in good condition so want to switch it out. I’ve remove the axle and non drive cup easily, it was well greased.

The drive side however is being difficult. It has a notch in the cup, but there is also also a notch in the shell that seems to have a locking tab in it and I can’t seem to budge the cup in either direction.

Has anyone had experience with something similar and is there a trick to it’s removal?

Thanks in advance.
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