Ok, tested again this morning. No power on the terminals. Checked the connectors again to make sure there is not loose connectivity etc.
Then unplugged the connectors and then used the multimeter directly against the pins. No power. Should there be power with no connection to the valves?
Then dis-assembled the set up, removed the BBB (to isolate the problem) and connected the power and checked with the multimeter directly against the pins. No power.
Is there anything else I can check? Is my OSBo defective? I hope not!!