Was at a small regional airfield where they allowed (with some bad grace) formations to enter the ATZ, but formations had to break before the circuit and land individually
The reason that I asked the question was that until now I have politely reminded ATC on first contact that we are a formation (in case they have not noticed on the flight plan), and then requested permission to land in formation. That unfortunately gives some ATC the chance to refuse! So I am tempted in future to simply proceed in formation, and only break if ATC specifically deny permission to land in formation.