Wednesday 01 Jan New Year's Day
Friday 18 Apr Good Friday Monday 21 Apr Easter Monday Monday 05 May Early May Bank Holiday Monday 26 May Spring Bank Holiday Monday 25 Aug Summer Bank HolidayWednesday 24 Dec Christmas Eve (Markets closing process commences from 12:30 London time)
Thursday 25 Dec Christmas Day
Friday 26 Dec Boxing DayWednesday 31 Dec New Years Eve (Markets closing process commences from 12:30 London time)
Source: http://www.londonstockexchange.com/about-the-exchange/company-overview/business-days/business-days.htm