The Heston Control Tower complex was demolished in 1978, and was recorded by a photographer form the City of London Museum, I have copies of the contact sheets, very sad.
The large hangar mentioned in Flap40's post was known as the Jackaman hangar and does in deed still stand, protected by a preservation order. There are some other hagers next to it, although they have been altered over the years.
The "odd angle" meant that the buildings, when viewed from the air, looked like an aeroplane in plan form, or an arrow, pointing North. This can still be seen in google earth pictures as the new buildings retain the profile. At the tip of the "arrow", sunken into the ground was the famous clock, 16ft in diameter... you can just see it in photo in Flap40's post.