UKEC is the governing body for ENUM in the UK. It is a membership organisation and the directors are elected. It was formed under the auspices of the DTI (then BERR now BIS).
ENUM is an ITU recommendation E.164 and is a way to put telephone numbers into DNS (i.e. on the Internet). It allows users to decide how they want calls to get to their numbers.
Though UKEC has been around since 2006, the .4.4.e164.arpa tree only went live in March 2009.