Ex-military jets are flown on a permit to fly and have an individual training course approved by type that each candidate undergoes. This then results in a type rating. The content of each course is judged on the operation complexity of the type. The JP as an example is a very simple VFR only permit aircraft.
Not sure that there's a JP type rating. They are usually operated under an exemption granted by the CAA following an approved course of training.
thought John had a CPL?
See IO540's post above
JT does have a 707 TR so why only SIC? Is it that one needs to be an ATP to sit in the LHS of a ME jet of that size? I wouldn't have thought so.
Fairly sure he would ONLY need an ATP to fly in command if it was a Part 135 operation.