All paid up members should be on the Power of Ten website (though when you get added can be a bit random).
Power of Ten is a fantastic resource from British Athletics that tracks all your performances over time, showing all time PBs for each distance, PBs for that year, national rankings for each distance, etc.
It’s weighted towards road, track and parkrun performance but most of the XC we run seems to be on there, together with some of the fell events – seems to depend on whether the race organiser submits them.
Anyway, it’s all here: RunHelsby on Power of Ten
You can also register at http://www.runbritainrankings.com/ for a whole world of data, cross referenced by each race. Roadie based.