Useful stuff can be found on the DTI website - but to save you looking for yourself, I'll publish bits and bobs here as I come across them.  For instance, browsing on the DTI website today I discovered that the bank holidays had been posted up until 2009!  Now there's something that's always useful.  You can either see for yourself at http://www.dti.gov.uk/employment/bank-public-holidays/index.html or I've detailed them below:

	2006	2007	2008	2009
England and Wales
New Year's Day	2 Jan ■	1 Jan	1 Jan	1 Jan
Good Friday	14 Apr	6 Apr	21 Mar	10 Apr
Easter Monday	17 Apr	9 Apr	24 Mar	13 Apr
Early May Bank Holiday	1 May	7 May	5 May	4 May
Spring Bank Holiday	29 May	28 May	26 May	25 May
Summer Bank Holiday	28 Aug	27 Aug	25 Aug	31 Aug
Christmas Day	25 Dec	25 Dec	25 Dec	25 Dec
Boxing Day	26 Dec	26 Dec	26 Dec	28 Dec
■ Substitute Bank Holiday in lieu of 1st Jan
▲ Substitute Bank Holiday in lieu of 25th Dec
Northern Ireland
New Year's Day	2 Jan ■	1 Jan	1 Jan	1 Jan
St Patrick's Day	17 Mar	19 Mar	17 Mar	17 Mar
Good Friday	14 Apr	6 Apr	21 Mar	10 Apr
Easter Monday	17 Apr	9 Apr	24 Mar	13 Apr
Early May Bank Holiday	1 May	7 May	5 May	4 May
Spring Bank Holiday	29 May	28 May	26 May	25 May
Battle of the Boyne (Orangemen's Day)	12 July	12 July	14 July	13 July
Summer Bank Holiday	28 Aug	27 Aug	25 Aug	31 Aug
Christmas Day	25 Dec	25 Dec	25 Dec	25 Dec
Boxing Day	26 Dec	26 Dec	26 Dec	28 Dec
■ Substitute Bank Holiday in lieu of 1st Jan
▲ Substitute Bank Holiday in lieu of 26th Dec

 
Dates in bold are bank holidays which have been introduced since the 1971 Banking and Financial Dealings Act, and are routinely proclaimed each year by the Queen; dates in italics are subject to Proclamation by the Secretary of State for Northern Ireland and are not included in the Royal Proclamation. All other dates have been designated bank holidays under the Banking and Financial Dealings Act 1971.