the different of the flags in four part of British Isles

British Isles has four part which are England,Wales,Scotland and Republic of Ireland.I want to say something about the different flags of the four part.
The flag of England called St George's Cross;the flag of Wales called Dragon of Cadwallader;Scotland has two flags,one is St Andrew's Cross and the other is Lion rampant;Ireland is the simelar as Scotland,also has two flags,which named St Patrick's Cross and Republic of Ireland.
The Union Jack is the national flag of the UK.It is a combination of the cross of  St George.the cross of St Andrew and the cross of St Patrick.But Welsh person perhaps not like the flag becouse there is no dragon in the flag.