My area (Lincolnshire) is completely devoid of any permanent rides so I am going to have to create my own in Strava route builder. (and send the gpx to presumably the north east organiser?).
Don't think this is the case. See @Phil W's map.
Controls - and therefore possible start points.
Spalding 52.7858, -0.1529
Colsterworth 52.806568,-0.619047
Keightley 52.849082,0.010024
Holt 52.905438,1.092832
Burnham Deepdale 52.965817,0.683615
Boston 52.9783814,-0.0389212
Sleaford 52.998419,-0.409453
Coleby 53.134459,-0.5402847
Skegness 53.143751,0.342896
Woodhall Spa 53.151939,-0.218044
Waddington 53.166190, -0.542070
Horncastle 53.207948,-0.1168437
Lincoln 53.2182907,-0.5905157
Wragby 53.287219,-0.3053647
Caenby Corner 53.39298,-0.547641
Gainsborough 53.396874,-0.773958
East Butterwick 53.545408,-0.73637
Kilnsea 53.620727,0.130235
Barton-Upon-Humber 53.685807,-0.439522
(NB May not all be in Lincolnshire. Defined by Spalding in the south, Barton in the north, Gainsborough in the west and the North Sea (Skegness!).