I would also expect aircraft in the cct to give the required info to approaching aircraft. This is SOP in France, but may be a bit new to Brits.
Actually, it isn't.
We make circuit calls, but 123.5 is not used to talk between aircraft. At least not officially, anyway. All flying below 3000 outside controlled airspace is normally on QNH and we look at the windsock. I fly at a small airfield, uncontrolled. The no wind situation is dealt with by having a preferential runway used in winds of less than 2 metres/second. Circuit direction at our field is left hand on one runway, right hand on the reciprocal. All airfield charts are free download so no excuse for getting it wrong.
And calls in french, of course, unless at a controlled field, where you can choose english or french.