Yes thanks. It's looking good for stabilized mode at least, the ailerons all move in the right direction when armed and I fly the plane round the dining room like a kid. It also responds to the transmitter input.
I've just noticed that when the airspeed sensor and the M8N compass is plugged into the i2c splitter, QGroundControl reports that the airspeed sensor is missing too. Unplug the M8N and the airspeed sensor appears again.
No satellites found in GC when the GPS is plugged in either with or without the i2c compass plugged in.
I'm looking forward to receiving the second GPS module to I can test it out.
I do need two GPS modules eventually because this aircraft is planned for autonomous BLOS missions with automatic landing, which is going to be interesting...