Hi Guys
thanks very much for the posts. To answer Larry the Midi output drivers available to me in Opt/Midi/Audio drivers are Microsoft midi mapper, Microsoft GS Wavetable synth, and Coolsoft virtual midi synth.
Non of these will work with my midi keyboard.
But the main point is the keyboard IS recognised and shows up in the midi input drivers and IS selected. The laptop recognises the keyboard immediately on connection.

I do connect the keyboard prior to opening BIAB

But not only is there NO sound, there's nothings at all. When I tap the keyboard with "Big Piano" pane open there should be a corresponding movement on screen.
This must be an issue between BIAB 2014 and connecting a midi keyboard. With past BIAB versions I have not had these issues.

And finally my keyboard works 100% all of the time when I use it with other programs (Ignite, Kontakt 5, Cakewalk Sonar etc)