On 9 June 2021, an Airbus A320 Captain performing a relatively light weight and therefore rapid-acceleration takeoff from London Heathrow recognised as the standard 100 knot call was imminent that he had no speed indication so announced and performed a high speed rejected takeoff. Subsequent maintenance inspection found that the left pitot mast was blocked by the nest of a seasonally active solitary flying insect, noting that the aircraft had previously been parked for 24 hours on a non-terminal stand. Similar events, including another rejected takeoff, then followed and a comprehensive combined Investigation found all were of similar origin.