Here are some of the key facts for voter registration on 20 April 2015:

• there were 485,012 applications
• this included 469,000 digital applications
• 9,900 were applications from British citizens overseas
• 137,400 applications were received from 16-24 year olds

Some of the more general facts about voter registration include:

• since June there have been 9,218,788 applications: of these, 2,131,017 have been from 16 to 24-year-olds
• since 1 December there have been 5,236,895 applications: of these, 1,388,862 have been from 16 to 24-year-olds
• since 1 March there have been 3,029,497 applications: of these, 817,168 have been from 16-24 year olds
• overall 77% of applications since June have been made online, but this has been over 90% in the last few weeks
• there have been 68,449 applications from British citizens overseas since 1 March
• user satisfaction has remained above 90%, with the most recent figure of 94.1%

You can find more data about voter registration and other GOV.UK services on the GOV.UK performance platform.