Gee, I thought it was only we Americans who engaged in such jingoism.

https://metro.co.uk/video/schoolchildren-encouraged-sing-patriotic-song-one-britain-one-nation-day-2445691/?ito=vjs-link

The lyrics to the song, which the organisation claim was written by schoolchildren in Bradford, are as follows:

One Britain One Nation

Chorus:
We are Britain
And we have one dream
To unite all people
In one great team (repeat)
Verse 1:
Our nation survived through many storms and many wars
We've opened our doors, and widened our island's shores
We celebrate our differences with love in our hearts
United forever, never apart
Chorus:
We are Britain
And we have one dream
To unite all people
In one great team (repeat)
Verse 2:
So many different races, standing in the same place
So many different faces, moving at the same pace
We all stand together with pride in our hearts
United forever, never apart
Chorus:
We are Britain
And we have one dream
To unite all people
In one great team (repeat)
Outro:
Strong Britain, Great Nation
Strong Britain, Great Nation
Strong Britain, Great Nation
Strong Britain, Great Na-a-tion.
Written & Performed by: St John's CE Primary School pupils, Bierley, Bradford

Source: https://metro.co.uk/2021/06/23/what-is-one-britain-one-nation-and-what-are-the-lyrics-to-their-song-14817409/