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British Like Flags
http://www.photius.com/flags/british_related.html
British like and Commonwealth Flags from the Flag Identifier. They resemble or contain the Union Jack.
England
http://www.theodora.com/flags_5c.html
Small GIF of St. George's Cross.
How to Draw the Union Jack -- Accurately.
http://www.jdawiseman.com/papers/union-jack/union-jack.html
The specification of the flag of the United Kingdom
Northern Ireland
http://www.theodora.com/flags_13a.html
Small GIF.
United Kingdom
http://www.atlasgeo.net/flags/anglais/html/Eunitedkingdom.htm
Animated flag image, free for personal use.