Apologies for not responding in a timely manner, unfortunately I’ve had to do some work which annoyingly occasionally takes precedent over STW 🙁
3:25/km does indeed correspond to a 2:24 marathon (2:24:09 to be exact apparently) but I will admit to not having run that yet. I ran 3:27/km in Bournemouth (2:26) having run the first half waaaaay to fast (1:10) and blowing up at the end, so perhaps I’m a little cheeky stating 3:25, but that’s my goal for London.
If I had run that time last year, and had I been 40, that would put me 2nd in Britain on the V40 rankings for the country for the year, so hopefully I’ll be in a similar place.
Historically 2:24 would mean 2nd in 2018, 3rd in 2017, 3rd in 2016, 1st in 2015, 2nd in 2014, 1st in 2013-2010 so hopefully I’ll be there or thereabouts