Correction, flag of the United Kingdom. The flag of Great Britain doesn't have the St Patrick cross as Ireland was not fully incorporated under the crown until 1807 I.e the formation of the United Kingdom of Great Britain and Ireland. Wales is not featured because it's a principality, not a kingdom.
The Irish tricolour of green representing the Gaelic tradition of Ireland, orange representing the followers of William of Orange in Ireland, and white representing the aspiration for peace between them
Great Britain is the official name given to the two kingdoms of England and Scotland, and the principality of Wales. The United Kingdom (UK) includes these areas as well as Northern Ireland. Britain refers to only England and Wales, though some will shorten Great Britain with this term.
The Cornish tartan reflects the colours of Cornwall Gold represents the Celtic Kings of Cornwall Grey represents the white tin that's smelted from the black ore in Cornwall Blue represents the sea of the Cornish coastline Black and white represents the flag of St. Piran Red represents the Cornish chough's red beak and legs