11 Sept. 1915 Britain’s first Womens Institute opened in Wales. Although it has never been adopted as the WI's official anthem,the song "Jerusalem" is sung at the opening of NFWI AGMs, and many WIs open meetings.

JERUSALEM   aka   And Did Those Feet in Ancient Time   - Many recordings on YouTube       https://www.youtube.com/results?search_query=jerusalem+song

Women's Institute,article from Wikipedia https://en.wikipedia.org/wiki/Women%27s_Institute
And Did Those Feet in Ancient Time,article from Wikipedia.     https://en.wikipedia.org/wiki/And_did_those_feet_in_ancient_time