Of-course, once you get Openreach FTTP naturally the copper will become redundant because there will be no copper or FTTC service that can be ordered ever again.
That only applies if you are in a "copper stop sell" exchange area, which is usually triggered when >75% of properties have FTTP available.
Well irrespective of the 75% figure for exchange area, any postcode that was upgraded to FTTP does not give ADSL or FTTC option with the exception of Pop Telecom (the only ISP that I found).
The broadband availability checker ADSL, ADSL2+ and SOADSL availability: If shown at FTTP or SOGEA premises,ADSL, ADSL2+ and SOADSL are not available to order due to WLR Withdrawal stop sell rules.
That's personally what I have experienced looking at properties e.g. Winterton House a Tower Block in Shadwell, London E1 2QR before FTTP became available it was showing only FTTC packages. After it went live a few years ago it no longer shows FTTC packages for any ISP other than Pop Telecom.
You'll find that majority of ISPs just don't fetch those packages, unless they are able to offer them via a telephone call.
The system will simply not give you ADSL/2+ or FTTC packages. Just like FTTC available areas can no longer order ADSL/2+
Technically there's no reason you can't order ADSL in an FTTC area, but most SPs now choose not to offer it.
To be fair, the only ISP that I have found giving me the option to order ADSL in both FTTC and surprisingly even FTTP areas is Pop Telecom!
And the only other ISP that gives ADSL option is Direct Save Telecom and BT but only in ADSL only areas.
While contrary to what Google AI says.AI Overview
Major UK Internet Service Providers (ISPs) that still offer standard ADSL (copper) broadband include BT, EE, Plusnet, Sky, NOW Broadband, and TalkTalk
However, this appears to be false. When I search for those particular postcodes that have only ADSL... These are the results I find.
Sky: Unfortunately Sky Broadband is not available at your address
TalkTalk: We can’t offer a broadband plan today
All TalkTalk broadband plans use full fibre broadband. At the moment, our Full Fibre isn’t available in your area, so we can’t offer a broadband plan today.
Zen: Unfortunately, we've not been able to find any online products for your address. Please call to check with our Sales Team on 01706 902912.
Vodafone: Great news, you're in our 5G Broadband area
Plusnet: We are very sorry
Sadly due to an error we cannot process this online - please call our helpful advisors to proceed to checkout.
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In my case with Community Fibre being available, both Vodafone and TalkTalk no longer show FTTC options anymore!
Interestingly postcodes in London with no FTTC option (that have Community Fibre) will only provide FTTP for both Vodafone and TalkTalk that previously would not even show ADSL as an option!
Whether a special request via ISP phone call gives you the option, I do not know. But even if an ISP gives you this option through a telephone call, you are still at a disadvantage as you don't get the voucher offers that you typically get through Uswitch or other broadband comparison site. This ultimately leaves the copper line useless unless you don't even have an Altnet or VM to choose. Extremely few places in the UK will neither have an Altnet or FTTC option available to make ADSL still valuable. Most of these people opt for 4G or 5G broadband service instead.