I love Worms, but if there’s a runner-up for “Britain’s most tenacious indie games company” then surely it is Hello Games. They launched No Man’s Sky in 2016 to universal disappointment and fan outrage, but kept working on it post-launch (under extreme stress and with little income to speak of) for years until they met & exceeded fan’s original expectations. Gratified fans eventually paid to put up a “Thank you Hello Games” billboard on a road near their office. The whole story is incredible and worth your time:
https://youtu.be/O5BJVO3PDeQ