Apple Watch - stop talking to me

For some peculiar reason, the Workout app on my Apple Watch started talking to me this morning …

Whilst that's not necessarily a problem, hearing a disembodied voice coming through my AirPods at 0600ish, whilst out on my morning walk was somewhat disconcerting

Thankfully a quick Google came to the rescue: -

watchOS 8: Siri on Apple Watch can announce your progress during a workout

which led me to the Apple Watch app on my iPhone : -

Why this started today, given that I updated to watchOS 8 a week or two back …. 🤷‍♀️