Sidmouth has a connection to Barcelona:

Sidmouth author on UNESCO writing residency in Barcelona | Sidmouth Herald

This blog has also connected Sidmouth and Barcelona:

Solarpunk & the world of cryptocurrencies – Sidmouth Solarpunk

SolarPunk and Sustainable Tech – Sidmouth Solarpunk

Fantasy writing and technology are indeed keystones of the solarpunk movement – but Barcelona has lots to offer…

how solarpunk are Barcelona and Madrid? : r/solarpunk

Including its architecture:

Connecting solarpunk to art nouveau is pretty insightful. I think any new movement like this pulls from some historical reference to frame the idea.
Having visited Barcelona and seeing Gaudi’s influence on the architecture there, I understand how a few notable buildings could actually influence the peoples’ mindsets.
There has been a ton of advancement in ecological solutions and biomimicry, but tying those changes to design that mirrors nature in an art nouveau way could translate the underlying complexity to something our lizard brains will understand at a glance – it is a powerful abstraction that ties together our innate desire for a safe corner of nature and our social desire for something new and cool.

The Imaginarium of a Solarpunk Architect | Hacker News

Yes, Art Nouveau is a real inspiration to the look and ethos of the SolarPunk movement:

Solarpunk and Art Nouveau – The Solarpunk Druid

For example:

Gaudi, House, Spain, Europe, Building, barcelona, catalonia, architecture, landmark, city | Pxfuel