DEFRA website http://www.defra.gov.uk/animalh/diseases/notifiable/disease/ai/index.htm provides the following advice: -
The advice given here applies in all circumstances where members of the public may come across a dead bird, regardless of whether there is any avian influenza in the UK.
If you find one or more dead swans/wild fowl (ducks and geese); more than 3 dead birds of the same species or more than 5 dead birds of different species, in the same place, you should contact the Defra Helpline (08459 33 55 77). Currently the Helpline is available between the following hours Monday - Friday 6.00am to 10.00pm and Saturday - Sunday 6.00am to 10.00pm. You will be asked for details of your finding and its location.
If the dead bird is a single, small garden, or wild bird then you do not need to call Defra. You should:
Wild birds can carry several diseases that are infectious to people and some simple hygiene precautions should minimise the risk of infection. It is hard for people to catch avian influenza from birds and the following simple steps are also effective against avian influenza.
If you have to move a dead bird
1. Avoid touching the bird with your bare hands
2. If possible, wear disposable protective gloves when picking up and handling (if disposable gloves are not available see 7)
3. Place the dead bird in a suitable plastic bag, preferably leak proof. Care should be taken not to contaminate the outside of the bag
4. Tie the bag and place it in a second plastic bag
5. Remove gloves by turning them inside out and then place them in the second plastic bag. Tie the bag and dispose of in the normal household refuse bin.
6. Hands should then be washed thoroughly with soap and water
7. If disposable gloves are not available, a plastic bag can be used as a make-shift glove. When the dead bird has been picked up, the bag can be turned back on itself and tied. It should then be placed in a second plastic bag, tied and disposed of in the normal household waste
8. Alternatively, the dead bird can be buried, but not in a plastic bag
9. Any clothing that has been in contact with the dead bird should be washed using ordinary washing detergent at the temperature normally used for washing the clothing.
10.Any contaminated indoor surfaces should be thoroughly cleaned with normal household cleaner.