Originally Posted by
trim it out
The number two was always there, just out of shot behind the intercepted aircraft...........
Not sure that you're exactly correct there.
At about 1:26 an aircraft can be seen passing left to right at a lower altitude (about eight o'clock, sort of coming up through the clouds) and the BA crew man says "there's the other guy".
Looks like he may have climbed from a different location and performed a little circuit to come up from behind and join his mate.