^ last I checked though, Maiden had been very ignorant of UK shows for the past several tours... BOS was the first where they got a whole UK leg I think in at least 20 years...
Methinks you should check again.
The have played full UK tours supporting all albums since the reunion: in 2000 (London, Glasgow, Manchester, and Birmingham), 2003 (Newcastle, Nottingham, Sheffield, Glasgow, Manchester, London, Cardiff, and Birmingham), 2006 (Newcastle, Sheffield, Glasgow, Manchester, Cardiff, Birmingham, and x2 London), 2011 (Glasgow, Aberdeen, Newcastle, Sheffield, Nottingham, Manchester, Birmingham, Cardiff , Belfast, and x2 London), and 2017 (Nottingham, Manchester, Sheffield, Leeds, Newcastle, Glasgow, Aberdeen, Liverpool, Birmingham, Cardiff, and x2 London). The latter is their biggest UK tour ever.
They have also played shows in London in 2001 (x2 at Shepherds Bush Empire), 2002 (x3 at Brixton Academy), 2005 (x1 at Hammersmith Odeon), 2007 (x1 at Brixton Academy), 2008 (x1 at Twickenham stadium), and 2013 (x2 at the O2 Arena).
Last, but not least, they have headlined festivals in 2003 (Download), 2005 (Reading and Leeds), 2007 (Download), 2010 (Sonisphere), 2013 (Download), 2014 (Sonisphere), and 2016 (Download).
That is hardly being ignorant of UK shows for the past several tours!