Gatwick, Heathrow, Stansted and Luton work basically the same.
cycles of 10 days with 2 mornings (7am til 2pm), 2 afternoons (2pm until 10pm) and 2 nights or spins (mornings or afternoons). At night you won't work more than 5 hours in total, the rest will be sleeping time.
Some days you will do early morning start, mainly hearthrow, which is between 6am and 6.30 am. On those days you are sent home earlier (between 10am and afternoon).
As HD says it is 180 days of proper work at the end of the year. 18 days a month with 28 days of leave + 8 days of bank holidays, which means you work 10 months.
On heathrow we do between 30 minutes and 90 minutes of controlling on mornings and afternoons, followed by a 30 min brake and so on...