OK - managed to get a steady locked LED and the device is paired up - Device manager shows com9 and com11 - StemPro connects to com9 and I can send AT commands - but nothing is received , and com11 won't open !!

This won't be too much of in issue under PBP as I can modify the code so that serial out goes down one pin (B0 for example) and serial in comes in via another (B1 for example)... But then this assumes that windows will assign the same port numbers each time on all devices.