There's like a gate or indent between max dry and reheat. You need to put the throttles to max dry against the lock, then throttle back a bit, then push forwards again an they go through the lock.
The hole on the fin leading edge panel might be an air intake used for pressurising / purging the fin fuel tank
A combination of Swiss cheese and good old techie ingenuity still resulted in at least two flap to fuselage incidents at St Athan!
There's an electrical plug for a feedback system that stops the wingsweep at the angle selected on the throttle box. If you disconnected this electrical plug, applied hydraulics and then move the wingsweep lever, then the wings will keep on moving (it has no feedback telling the actuator when to stop) and if the flaps are down they will crush into the side of the fuselage. Just rear of the throttle box there's an electrical push button to select the size of the external fuel tanks, with "big jugs" fitted the wing sweep was limited.
25, 45 and 63 degrees rings a bell ?