In the 60s Waddo had three towers.
It had a very small WW2 (or pre) between 2 and 3 Hangars. This was very small and allocated to HMC. The next tower was forward of that one and housed the approach control. The third tower was built further forward again and housed the visual control.
Coningsby had a tower of the WW2 style shown above. When it was remodelled as approach and local the windows on the first floor were covered over to create the stygian gloom for the radar cabin. The visual control was built on top of that. In the late 90s it was discovered that the covered over windows of the approach control were crumbling never having been built to last 50 years. The new tower became an imperative. It has a virtually frameless visual control room.
The Wainfleet tower was built to a 70s design and its control room was on the 5th floor simply to afford good visibility out to 6 miles or more.