[woodcote]

It sounds like you have enough source material in your head, but here are some pages from a book of climbs for cyclist featuring two hills in the region

You need to have the right trees, and the right details of those little parapet walls, the road markings...

Yep, there are a lot of details to consider and plenty of choices from across the region. One major constraint will be how far my skills will stretch. Thankfully there are a lot of photos and video online - and I have found cycling pics a good source. Plus there's not much the model railways community hasn't been able to recreate in various scales. I shall be trawling that knowledge-base extensively.