Containers IaaS, plus managed Postgres. So far I’ve only found UK hosts that do VPS, VMs, or bare metal- the abstraction above this is (heroku, fly.io etc.) makes Ops 10x easier for smaller companies
Civo.io have had both for many years and for Katapult.io these are coming in April. Both are british companies, if you need referring feel free to shout.
Thanks for these recommendations - both of these look like the sort of thing I've been looking for and failing to find for several weeks. And @albertgoeswoof - pretty sure we'll be gradually moving a lot of clients over to you soon too.