10
OK. Before, when I looked under 'blocks generated by [eg Forum]' there were none, nor under any of the others and I couldn't see how to create them. It didn't make sense to me and I couldn't see why there were blocks relating to the system but not for any of the other modules.
When I selected 'blocks generated by [eg Forum]' then it has to read:
'Blocks visible in "All Types"
or nothing shows up - presumably because I haven't created any blocks which might show under other circumstances. I don't think this is too clear in the instructions. In the light of this 'discovery' I have looked at the Operation Guide again (sec 2.5) to see if I had missed something. I don't think so. It is unfortunate that for whatever reason the default setting on the blocks admin section is not the one which shows up the blocks available to a particular module. Hope this helps anyone else with this problem.