Your encounter must have been quite a surprise !?
For the crew of the 707, possibly. I don't recall any great fuss on our part (professional crews on 201 of course!) - and doubtless our ESM had picked up his radar transmissions some time earlier (though I don't remember hearing that either - maybe I was operating the galley at the time of first contact
).
Intelligence reports a few days later suggested that we had been visually identified as "a VC10".