Today, parts of the old RAF base at Woodhall Spa make up the Thorpe Camp Visor Centre. However, if you look around the area, there are other hidden remains of the old base.
Before my visit, I found some blog posts and watched some YouTube videos on the derelict parts of the base. However, when I got to Woodhall Spa, some of them have now sadly been demolished (video below).
However, if you know where to look (some locals told me) there are still some buildings that remain.