No. 10:
Probably not me, but possibly a FISO whose job depends on Section 52 Planning Agreement compliance. If one is approaching from the NE that would probably be after leaving the London CTR in which case it would seem preferable to head west until north of the ATZ and make the non-circuit-direction turns outside and join directly from the north.
N0. 11:
Mid-downwind joins were certainly not taught by the previous incumbents of the flying school adjacent to the Bistro when I was instructing for them. As a local ATS CAA examiner I would like to know if joining mid-downwind is being taught by either school. Mid-downwind joins cause cutting-in and bunching. We do observe it frequently and usually results in an innocent party having to go-around.