Stanley Gibbons "Stamps of the World" Catalogue ("Simplified")
1979 (1 volume, partly split) £2 -Reduced to £1-
1991 (2 volumes foreign) £4 -Reduced to £2-
1993 (2 volumes, foreign) £5 -Reduced to £3-
1997 (3 volumes) £10 -Sold-
2004 (4 volumes) £20 -Reduced to £15-
2004 (4 volumes) £20 -Reduced to £15-
2007 (5 volumes) £25 -Sold-
2008 (5 volumes) £25 -Sold-
2008 (5 volumes) £25 -Sold-
2009 (5 volumes) £30 -Reduced to £15-
2009 (5 volumes, very worn) £26 -Reduced to £15-
2010 (5 volumes) £35 -Reduced to £25-
2011 (6 volumes, worn) £30 -Reduced to £20-
2012 (6 volumes, very worn) £35 -Reduced to £20-
2016 (6 volumes) £75 -Sold-
2016 (6 volumes, very worn) £50 -Sold-

Some others (odd volumes, etc.) not listed above are also reduced.

also available;
Scott (published in USA) 1997 Standard Postage Stamp Catalogue (4 volumes, whole world excluding USA), plus 1989 Scott USA Specialized. Lot for £25. -Reduced to £20-

Stanley Gibbons Commonwealth Catalogue
1995 (2 volumes, all periods) £7 -Reduced to £4-
1997 (2 volumes, all periods) £8 -Sold-
2000 (2 volumes, all periods) £9 -Reduced to £6-
2002 (2 volumes, all periods) £10 -Sold-
2003 (1 volume, 1840-1952) £3 -Reduced to £2-
2010 (1 volume, 1840-1970) £5 -Sold-
2012 (1 volume, 1840-1970) £10 -Sold-
2017 (1 volume, 1840-1970) £20 -Reduced to £15-
2019 (1 volume, 1840-1970) £30 -Sold-
2020 (1 volume, 1840-1970) £35 -Sold-