Although the latest outbreak of bird flu seems to have come through processed meat, it's raised the possibility of infection from wild birds again.
If you're worried about this, and you find a dead bird, here's what Defra advises you to do.

http://www.defra.gov.uk/animalh/diseases/notifiable/disease/ai/wildbirds/

Basically - don't touch it with bare hands, - if you have to, pick it up in a bag, wearing gloves, and notify Defra on (08459 33 55 77).