The Vexillology of Wales and the Union Flag - Historic UK

Although the Union Flag represents the United Kingdom of Great Britain and Northern Ireland, it does not seem to include any Welsh symbols or colours

Why can't Wales be incorporated into the Union Jack? For example

The Vexillology of Wales and the Union Flag - Historic UK

Union Jack, finally representing a bit of Wales : r/vexillology

The United Kingdom

What is the difference between the Union Jack and the England flag

The Real Reason Why Wales Isn't Represented on the Union Jack

the Union Jack if Wales was represented instead of Northern

United Kingdom, Vexillology Wiki

25 readers' designs for a new union jack - BBC News

Visualizing Design: 196 Flags of Countries Around the World

Union Jack 'must always' be flown in 'superior position' to Welsh, union jack