At last! Well done Allemano, this is exactly the reason
The story goes that the pop-up headlights of the rallying TR7s used to bounce around too much on the rough rally surfaces, meaning at night that the BL drivers had to slow down as they couldn't see as well as the other cars with regular fixed lamps. The BL Works rally team initially tried to fix this by keeping the TR7's pop-up lights permanently fixed up, but even these moved around to much, so the solution from this photo was found with four regular fixed lights, which supposdly improved night vision. However, this solution was never used in a competitve rally as BL decided to drop the TR7 as its main rally car by this point!
So, well done Allemano; two points to you for finally solving this one before its second birthday!