Tim Streater wrote:

I also haven't been able to find the debt in £ terms
rather than as a %-age of GDP.
Year Population net public debt
million £billion
1990 57.238 151.90
1991 57.439 151.10
1992 57.585 165.80
1993 57.714 201.90
1994 57.862 249.80
1995 58.025 290.00
1996 58.164 322.10
1997 58.314 347.00
1998 58.475 358.60
1999 58.684 357.80
2000 58.886 349.30
2001 59.113 316.70
2002 59.366 323.10
2003 59.637 356.20
2004 59.950 391.00
2005 60.413 446.50
2006 60.827 487.20
2007 61.319 523.60
2008 61.824 557.20
2009 62.261 768.30
2010 62.760 1011.90
2011 63.285 1157.60
2012 63.705 1253.10
2013 64.106 1363.60
2014 64.597 1464.40
2015 65.110 1554.70
2016 65.648 1602.60
2017 66.040 1726.70
2018 66.466 1778.90
2019 66.867 1803.40
2020 67.255 1838.20 (est)

I only see one year where the debt reduced (2001 must have been a good
year for Gordon)

https://www.ukpublicspending.co.uk/download_multi_year_1990_2020UKb_17c1li111mcn_G1t