Flying insect?

Flying insect?

Observation - Flying insect? - UK and Ireland. Description: This insect landed on our decking in Salcombe, Devon, in July 2011. It was between 25 and 30mm long. Can you tell me what it is, please?

This insect landed on our decking in Salcombe, Devon, in July 2011. It was between 25 and 30mm long. Can you tell me what it is, please?