Formation of 4 aerobatic a/c
About 1630hrs this afternoon I noticed a formation of 4 single engine a/c, different types flying at about 3000’ in a North Easterly direction skirting the eastern edge of the Southampton Control Zone. They were in close formation and the lead A/c looked similar to a Russian aerobatic a/c. Any ideas about what they were and where they were going? Did not show on Flightradar 24