This isn't directly connected with Rendlesham time or location-wise but it's always stuck in my mind. I have an old book 'UFO Mysteries' and it mentions the following:
"Two policemen responded to a 999 call at Hainault Forest, Essex early one morning in 1977, and spotted a tent-like object glowing red through the trees. They watched it 'pulsing' for three minutes, then it dissolved into darkness.
I've always thought that the similarities between this incident and Rendlesham are striking.