If you are a twin (identical or non-identical) aged over 15 who would like to volunteer to join the 10, 000 twins on the register of the Twin Research Unit at St Thomas' Hospital, call 020 7188 5555.

BBC: NEWS | Health | Genes to blame for restless sleep

The Constitution Unit pointed out that the Scottish parliament might want to improve the accuracy of the register of voters to make proportional representation work better.

ECONOMIST: Scottish devolution