I don't get it?
If you have ATC they will give you the runway in use, cct direction, joining instructions, so no need for an OHJ.
At an uncontrolled field where aircraft with radios are operating, a call on the new UK unicom 135.475 should provide the same information. So no need for an OHJ.
Armed with the full airfield information obtained from ATC (or French style from other flyers,) it is easy to position yourself to join downwind at cct height.
Why perform a potentially dangerous manoeuvre when a bit of prior reconnaissance avoids it.
Edited to say that my instructor thinks few UK ppls are familiar with the use of unicom, so they are more likely to do an OHJ instead.
