Both aircraft were built by Percivals under licence. If you look at the photo in post 26 the Percivals production line was just to the right and behind the control tower.
If you look at Google maps the hangar line was to the left of Prince Way, Luton
Here is another view of Percivals. As you head down the approach road to the airport towards the white farm house Percivals would be on your left.
