This insect flew onto someones shirt last Monday and I managed to get a photo. It was about an inch long but its tail was about three times the length of the body and was made of what looked like three hairs. The wings were dark and it had two pairs of legs. As there is a pond in the garden next door we thought it may be a damsel fly but I think it was too small. We have never seen one before but someone has suggested an ichneumon wasp. Can anyone help?