2) Joining FL70 at Malby puts you in the teeth of 'DL' departures on their SID, hence higher level requirement (and different join point referred to above).
Ah, yes I did see the note and wonder why the standard join was at WOTAN at 90. Since it's initially outside controlled airspace and I wanted the FPL accepted at 70, I chose a different join. Is DL really that busy? Could Bristol coordinate 70 with Lyneham?