I've just had an email about Bristol's Clean Air Zone from
GWR▸ , which seemed a bit surprising at first. In fact it makes sense; they're taking the opportunity to push the idea of trains as a way to avoid the zone fees, including by park & ride at Parkway and Portway. I take it the latter is now open... ! No, it seems it's not. But nearly.
Anyway, this is the page the email linked to:
https://www.gwr.com/about-gwr/what-you-can-expect/sustainability/bristol-clean-air-zone