Competitors must use any colour scheme for cube puzzles, as long as the puzzles show one colour per face in solved state.

Those looking at their favourite progammes for four hours a day face a 28 per cent rise in the risk.

The price of the 3.75 percent security maturing in November 2018 rose 1/4, or $2.50 per $1, 000 face amount, to 110 21/32.