Many thanks for taking the time on this.

I tried playing back on Apple TV through my TV set (not mirroring but via photos on the Apple TV).
Sadly had same result.

I will try putting some on a USB and playing that via TV somehow.

Marantz NR1710, 5x Martin Logan Fresco i, BW PV1 sub,, Panasonic TX55GZ950, Sky HD+,Panasonic DP-UB820 Blu-Ray.