Thursday 01 Jan New Year's Day
Friday 03 Apr Good Friday Monday 06 Apr Easter Monday Monday 04 May Early May Bank Holiday Monday 25 May Spring Bank Holiday Monday 31 Aug Summer Bank HolidayThursday 24 Dec Christmas Eve (Markets closing process commences from 12:30 London time)
Friday 25 Dec Christmas Day Monday 28 Dec Boxing Day (holiday)Thursday 31 Dec New Year's Eve (Markets closing process commences from 12:30 London time)
Source: http://www.lseg.com/areas-expertise/our-markets/london-stock-exchange/equities-markets/trading-services/business-days