A happy ending
I found an audio-optical cable in a local superstore.
1m length with 'larger' (standard) TV sized optical square plugs on each end. Thus a good TV connection.
The input to the Bluetooth device was resolved with a 3.5mm adapter plug which fitted over the square ended optical plug. Two adapters were in the cable pack.
The 3.5mm jack plug is mainly plastic with a short metal tip surrounding the optical core. This is know as a TOSLINK, which I understand is a Toshiba connection for some laptops and DVDs.
The TV required a configuration change to enable simultaneous 'speaker and audio' output opposed to 'optical' only which cut out the speaker with the optical plugged in.
Clear synced Bluetooth audio which switches on / off with the TV.
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Last edited by safetypee; 7th January 2024 at 09:41.
Reason: Clarity