I found the delay occurs with Bluetooth headphones connected via an adapter with an optical link to the TV audio. Physically plugging headphones in works fine, no sync delay, but it turns off the sound system audio. Could never get it properly working on our TV/sound system.
My aid fitting has been delayed until next Monday, audiologist is sick apparently.
Hmmm, this Lemmy.world issue is a nuisance. Maybe I should create an account elsewhere, can I do that and keep everything? IDK how all the Lemmy stuff links together etc.