Certainly had occasions in the 10 when shadowing a pair, usually in around 10 mile trail to start with, when the no2 would creep up on you as you formated on the leader and sandwich you between them. They would then slow down and with the K2 in particular you could find yourself close to the buffet with only limited manoeuvrability, very uncomfortable. All this time the lead gunner in his bubble would distract you by waving and showing magazines. When they got fed up with you they would put on power, increase the mighty roar of the engines and out accelerate you. They could also do the opposite, close the throttles and descend very rapidly, making it almost impossible to stay with them. They had no regard for airspace reservation, often flying through airways and NAT tracks and had several near misses with civies. Having said all that, Bear chasing was good sport and we did get pretty close, but only because all too often the F4 had RTB'd with some snag or other you understand.