diff --git a/calendar/egroupware.org/holidays.GB.csv b/calendar/egroupware.org/holidays.GB.csv
index 1d4e2a279e..4a79fa6666 100644
--- a/calendar/egroupware.org/holidays.GB.csv
+++ b/calendar/egroupware.org/holidays.GB.csv
@@ -1,48 +1,54 @@
 GB	New Year's Day	1	1	0	0	0
+GB	2nd January (or in Lieu of 2 Jan) [Scotland]	1	2	0	0	1
 GB	May Day	0	5	1	1	0
 GB	Spring Bank Holiday	0	5	99	1	0
-GB	Late Summer Holiday	0	8	99	1	0
+GB	Battle of the Boyne (Orangemen's Day) [NI]	12	7	0	0	1
+GB	Summer Bank Holiday [Scotland]	0	8	1	1	0
+GB	Late Summer Holiday [England/NI/Wales]	0	8	99	1	0
 GB	Christmas Day	25	12	0	0	0
 GB	Boxing Day	26	12	0	0	0
 GB	Good Friday	29	3	2002	0	0
 GB	Easter Sunday	1	4	2002	0	0
-GB	Easter Monday	2	4	2002	0	0
+GB	Easter Monday [England/NI/Wales]	2	4	2002	0	0
 GB	Good Friday	18	4	2003	0	0
 GB	Easter Sunday	20	4	2003	0	0
-GB	Easter Monday	21	4	2003	0	0
+GB	Easter Monday [England/NI/Wales]	21	4	2003	0	0
 GB	Good Friday	9	4	2004	0	0
 GB	Easter Sunday	11	4	2004	0	0
-GB	Easter Monday	12	4	2004	0	0
+GB	Easter Monday [England/NI/Wales]	12	4	2004	0	0
+GB	Substitute Bank Holiday in lieu of 26th	27	12	2004	0	0
+GB	Substitute Bank Holiday in lieu of 25th	28	12	2004	0	0
 GB	Good Friday	25	3	2005	0	0
 GB	Easter Sunday	27	3	2005	0	0
-GB	Easter Monday	28	3	2005	0	0
+GB	Easter Monday [England/NI/Wales]	28	3	2005	0	0
+GB	Substitute Bank Holiday in lieu of 25th	27	12	2004	0	0
 GB	Good Friday	14	4	2006	0	0
 GB	Easter Sunday	16	4	2006	0	0
-GB	Easter Monday	17	4	2006	0	0
+GB	Easter Monday [England/NI/Wales]	17	4	2006	0	0
 GB	Good Friday	6	4	2007	0	0
 GB	Easter Sunday	8	4	2007	0	0
-GB	Easter Monday	9	4	2007	0	0
+GB	Easter Monday [England/NI/Wales]	9	4	2007	0	0
 GB	Good Friday	21	3	2008	0	0
 GB	Easter Sunday	23	3	2008	0	0
-GB	Easter Monday	24	3	2008	0	0
+GB	Easter Monday [England/NI/Wales]	24	3	2008	0	0
 GB	Good Friday	10	4	2009	0	0
 GB	Easter Sunday	12	4	2009	0	0
-GB	Easter Monday	13	4	2009	0	0
+GB	Easter Monday [England/NI/Wales]	13	4	2009	0	0
 GB	Good Friday	2	4	2010	0	0
 GB	Easter Sunday	4	4	2010	0	0
-GB	Easter Monday	5	4	2010	0	0
+GB	Easter Monday [England/NI/Wales]	5	4	2010	0	0
 GB	Good Friday	22	4	2011	0	0
 GB	Easter Sunday	24	4	2011	0	0
-GB	Easter Monday	25	4	2011	0	0
+GB	Easter Monday [England/NI/Wales]	25	4	2011	0	0
 GB	Good Friday	6	4	2012	0	0
 GB	Easter Sunday	8	4	2012	0	0
-GB	Easter Monday	9	4	2012	0	0
+GB	Easter Monday [England/NI/Wales]	9	4	2012	0	0
 GB	Good Friday	29	3	2013	0	0
 GB	Easter Sunday	31	3	2013	0	0
-GB	Easter Monday	1	4	2013	0	0
+GB	Easter Monday [England/NI/Wales]	1	4	2013	0	0
 GB	Good Friday	18	4	2014	0	0
 GB	Easter Sunday	20	4	2014	0	0
-GB	Easter Monday	21	4	2014	0	0
+GB	Easter Monday [England/NI/Wales]	21	4	2014	0	0
 GB	Good Friday	3	4	2015	0	0
 GB	Easter Sunday	5	4	2015	0	0
-GB	Easter Monday	6	4	2015	0	0
+GB	Easter Monday [England/NI/Wales]	6	4	2015	0	0