jxk good point, essential to know how to do an OHJ if required. But it would be interesting to have an explanation from Shoreham & Gloucester ATC as to why they prefer OHJs.
Last time I visited Shoreham on a sunny Sunday it was seriously busy. Joining overhead felt like diving into rush hour traffic at Hyde park.
Quite scary really and did not seem a safe procedure, good lookout being vital.
Perhaps that is the reason some ATC units use OHJs, it shifts safety responsibility more to the pilots and reduces stress on the controller?