bit more info - (blown fuse should read blown bulb in one of the lamps) - I was hoping it might just be a faulty MCB that might be easy enough to replace, it seems to be working fine in terms of the switch, but there is no power to the sockets when tested with a voltmeter, and also by plugging in the lamps.
I did notice that when I flicked the MCB up and down, there was a clicking from the WPM's, I'm assuming this means there must be a current coming from the MCB. When switching on all circuits by pressing the buttons on all the WPMs, everything comes on except these two lamp sockets.
Does this smell like a possible Lutron problem?