A while ago Loupie and I went to Trewsbury Mead to look for the source of the Thames;

Thames Head

There’s a little cup in the Cotswold Hills
Which a spring in a meadow bubbles and fills
Spanned by a heron’s wing, crossed by a stride
Calm and untroubled by dreams of pride
Guiltless of fame and ambition’s aims
Thats the source of the lordly Thames
– Bret Harte

This field is official source of the River Thames,

The Inscription on the stone reads

The Conservators of the River Thames 1857-1974
This Stone was Placed here to Mark the source of the River Thames