Template:ENG

Current flag of the Kingdom of England, note this is the official up too date flag of the country.

{{ENG
|size=35px
}}

result:

{{ENG
|size=25px
}}
{{IRE
|size=25px
}}

result:

{{ENG}}

result:

When too use 35

Specifically when it is the main topic, like if it is the main belligerent in a war or in a infobox only linking too it.

When it is a sub-participant of a war, i.e not the main nation.