I live just north of Lincoln (4.5 miles) and a mate off here lives a couple of villages further up the road. There are no good rides locally with hills or anything technical, we did have a route round the Wolds when the weather was good in spring/summer there were a couple of options between 22 and 40 mile routes iirc. We did try them once in the damp and just clogged up with mud between wheels and frame, if it stays frozen then you might be ok but most of it was crossing fields (of the ploughed variety) and the rest was grass tracks really. The routes usually started at Walesby and headed over to Normanby Le Wold, go and have a ride up the road there 😉
Unfortunately i am away over the hols so can’t help out anymore than that, ps if you do by some way of a miracle find something good let me know 😆