Its only an estimation but good enough. Over 250m vplus(Vectoring) is almost as good as G.fast. And 7590 syncs about 10% faster than 7582 on my line tested with different modems.
Think this is a good choice, especially if you like to use your old POTS with box-features like audio-recorder. I have their M2, C4 and C5 DECT phones too, got them cheap used.
And I use 2 other 7590 for mesh and a 3rd to mesh over WiFi to neighbour house with DECT phones there too. Each DECT phone should be fixed to one router, otherwise internal calls to it will have problems.
If you have any questions how to do feel free to ask and dont be unpatient, I know its hard after getting a new toy.
Maybe we could clear up some things in front, that you are faster and wont have to change often to get what you like to have.
First: You have POTS and needed to use a splitter, no VoIP possible what could make things easier, is this correct?
How does the phone wall-outlet look like in UK? Pin, switching and connector schematics would be fine to predefine best and easiest connections.
I still dont understand the 4 or 6 pins of UK wall box and what’s inside this huge box, is this all really needed at all? All I know line comes on this funny plug on pin 2 and 5. What are the other 1-4 wires??? Worldwide only 2 (a and b) are used. And is there really only one jack or are there more to use more than one phone. How do you connect a splitter to it? They usually have 2 pins in from line, 2 pins phone out and 2 pins to modem. We have 3 sockets in Austria for 3 phones or audio recorder or whatever. On the first we plug in a cable to splitter, on this same plug the phone pins go back to this first plug and supplies the other 2 plugs for phones. If not enough you may get a second/third .. wall box to connect phones in other rooms, they all in daisy chain, so first phone will take over calls from other phones behind if picked up.
Sorry if I mixed up words, dont know how to name them correctly.
What I could find is your phones are connected in parallel and for each one an own wall mount box.
DSL splitter uses first one and have a phone jack and one for modem. Then things are easy. Use Y-cable and either the correct adapters for phone and DSL with RJ11 jack or make your own adapters to directly fits to your funny UK-system. Your phones should be connected to the Fritzbox Fon1 and/or Fon2.
This pinout in the FIRST picture shows on left side top Y-cable phone from splitter (outer 2 pins), down Y-cable DSL from splitter and on the right side DSL-port of 7590.
Here the english manual: https://assets.avm.de/files/docs/fritzbox/fritzbox-7590/fritzbox-7590_man_en_GB.pdf
On page 48 the connection scheme you will probably need.
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