It was a female Hornet (Vespa crabro) – at over 30mm the largest species of wasp in the British Isles.
A loud, deep buzzing noise signalled its arrival and accompanied its slow, air ship like flight around the room.
Fortunately, despite their menacing appearance, they are surprisingly docile.
Whereas not a year goes by without being stung by the more aggressive common wasps.
Having just written that I hope I’m not tempting fate as they do have a powerful sting.
This Hornet was easily caught and once photographed released back into the garden.