1000 QFE is the normal default but airspace restrictions can lower the overhead join height e.g. White Waltham or cct height. Some like Goodwood have different cct heights for fixed wing (1200) and rotary (800 IIRC)whilst Popham has 800 ft for all with an inner microlight circuit and outer conventional fixed wing circuit. One of those UK charms that can catch you out and as one poster says, a call to a new destination can advise on local foibles and any noise procedures.