I’ve set up an Overpass API server with Britain and Ireland data in it. The server is https://h24.atownsend.org.uk/ - see the page there for capabilities, usage policy and privacy policy. You can use any other Overpass Turbo instance to point to it; just follow these instructions. I’ve also added it to the wiki list.
I suspect that the big caveat for some people will be that it’s currently IPV6 only. Adoption of that is apparently just over 50% in the UK and just over 40% in Ireland. If you can see the website, you can use IPV6. Overpass Turbo runs in your browser and sends requests to a remote Overpass API instance, so it doesn’t matter whether the site hosting Overpass Turbo is IPV6-capable, it matters that your browser is.
The Britain and Ireland data is updated nightly. Area searches work OK, but there’s currently no metadata or attic data.
Setup of a similar server was described in a diary entry, so if you fancy running your own server, off you go…
Any questions - please let me know!