Re:
Thanks for the suggestions.
It’s not a full bike so unfortunately riding it isn’t a option. Nor is spending on a tool as the crank is probably only worth about £15 so I’d just cut it off as it’s toast now anyway. Tried a crowbar , big hammer , ball joint tool , and several other methods. Inc swearing at it a bit. Given up for today but think the dremel will need to Spring into action over the weekend.