It is a village quiz with the closing date at the end of January. The only river I have come up with is Sacramento as it contains Norman without the first letter but cannot justify where the remaining letters of C A S T come from
other thoughts:
-William (the Conquerer) was leader of the Normans .
-A word assosciated with Norman is Norman Villiers (motorbikes) and the VI could be the six , but cant see wear that leads
https://www.carandclassic.co.uk/car/C1248410