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 Holiday
Wednesday 24 Dec Christmas Eve (Markets closing process commences from 12:30 London time)
Thursday 25 Dec Christmas Day
Friday 26 Dec Boxing Day
Wednesday 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