This might be useful for other UK people on an FTTC broadband package who make zero use of the bundled landline telephone service.
My ISP (Aquiss) recently announced a forthcoming £3 pcm price bump due to the retail cost of the service from OpenReach.
In the same email they also pointed out that SoGEA is a thing, where you can have an FTTC broadband service without the associated landline service. Thus, you can save money by not paying for something you don't use.
As I've not had a phone plugged into the landline for a couple of years now, and never received any useful call on it for years before that, I leapt at the chance to reduce my bill.
In my case rather than going up by £3 pcm my bill will now go down by £8 pcm, so a saving of £11 pcm compared to what I would have paid after the price increase.
So, even if your ISP hasn't said anything about this it might be worth asking them about migrating to SoGEA instead of the usual FTTC with bundled landline.
There's more on the difference between SoGEA and normal FTTC service here: https://www.switchcraft.co.uk/broadband/types/what-is-sogea-broadband-everything-you-need-to-know/
Additionally, for anyone else on Aquiss, be aware that switching might involve changing IPv4 and IPv6 addresses. I'm still on addresses they lease from CityFibre, who are getting out of that business, so am being migrated to Aquiss's own pools as part of this change.