Dear Retro Grouch,
You are the Man!
Put it on my bench vice as advised and it worked!
Thanks so much.
Now I have the assembly out but there are no bearings on this side as there were on the non-drive side. It seems to be a fixed unit:
CHINHAUR, BB CH46 BC 1.37" X 24T
Tried to remove the spindle but it doesn't slip out...

Does the spindle hammer out of this assembly or is it not a serviceable part meaning I need to replace the whole thing?

Thanks in advance.
Cheers from London, UK
Pete