Well spoken Speedbird.
Airmanship, airmanship, airmanship.......
Remember the old BT advert......it's good to talk......
Announcing your intention to overfly an overhead is prudent to flight safety. The point about instrument procedures has already been touched on, Stapleford was the example - I have seen people fly overhead Cranfield above the ATZ only to fly straight through the published holding procedure. During this Cranfield ATC were constantly calling the unidentified a/c with no reply, they weren't even listening to the radio of the airfield they were flying over!
What's the old addage? Safety is no accident.........
Regards
