Yamaha Silent series Owner's Manual page 4

IMPORTANT NOTICE FOR THE UNITED KINGDOM
Applies to power adaptor
Connecting the Plug and Cord
IMPORTANT: THE WIRES IN MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may not
correspond with the coloured markings identifying the terminals in your
plug, proceed as follows:
The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal
which is marked with the letter L or coloured RED.
Making sure that neither core is connected to the earth terminal of the
three pin plug.