I intend to run AdGuard and WireGuard.
At least match current speeds.
No idea what that means... =P
Sorry. Gigabit ethernet? Wired ethernet? cable to the modem for PC? (i.e. only if you had 10gb nas for example). Don't worry about it then. "gigabit will be fine"
OK so we need 50Mbps+ wireguard speed?
No experience with this.
So ypiur options are quite limited for all in ones with DSL:
- Lantiq danube (ADSL onlu IIRC really long in the tooth)
- Lantiq xrx200 series, like the BT HomeHub5A, in my experience this already struggled at 50/10 Mbps as a full all-in-one dl-wifi-router with SQM. Repurposed to bridged modem duty this came close to servicing a 100/40 vdsl2 link (only for bidirectionally saturating traffic the aggregate fell a bit short)
- Lantiq vrx 518 like select version of AVM's Fritzbox 7530 or 7520, this seems to be capable of serving a 100/40 link as all-in one (I myself run this as bridged modem so have no firts hand experience)
Let's ignore 1 because this seems only historically relevant, 2) will work in the UK, not sure about 3, but my gut feeling tells me it should work....
Please, note that neither of these will support VoIP/SIP directly from the modem, so either you still have access to analog telephony from the ISPs line, or you will need an additional VoIP base station.
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I'd say so - yes.
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Oh wow. Thanks for the reminder. Completely forgot about that. IDK whether BT can handle arbitrary VoIP gateway.
edit:
We have like one ISP that can do that where I am on a consumer/prosumer/small business plan. What I did on another ISP and it worked was use the old modem as a voip gateway as it didn't care if it was behind nat. But another ISP that didn't work so I just had to give up on the voice.
Gigabit ethernet.
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What do you mean by this (bold added by me)?
OK so @moeller0 made a good suggestion if you can confirm it works with BT.
Looks like you just need to confirm that you buy a 7520/7530 and not the AX version.
https://openwrt.org/toh/avm/avm_fritz_box_7530?s[]=avm&s[]=fritz&s[]=box&s[]=7530
I guess also need to make sure you're comfortable with the flashing procedure?
Depending on cost I'd still go for cheapest bridge capable modem. but eh.
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I see no reason why it shouldn't.
If it doesn't involve soldering, I'm down. 
Well, for the 7520 (a variant of the 7530 specially packaged for a German ISP) only the V1 version will work and some version of that still need an out of tree patch, see:
https://openwrt.org/toh/avm/avm_fritz_box_7530
and
the latter link also has some pointers to the out of tree patches...
Yeah per their comment about whether you need voice service in that link.
And yeah back to the they say yes, but we'd still need to confirm it can do the band plan and band profile. But we're not worried about fancy 300mbps+ VDSL here so "should be fine".
I'd be much happier if there was a confirmed user example we could find =P
As in landline? I don't care about that 
Guess I'm the guinea pig 
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I note the vrx518 will likely work with VDSL and likely not work with ADSL judging from posts in this forum...
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Awesome. Thanks for confirming.
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Some models of the 7530 have a changed flash chip which is only supported for releases after 22.03 and snapshot builds. There is no known way to identify these boards from the outside. The only known box this happened with was an ISP-branded 7530 (A1).
On eBay, there's just 7530 (no 7520 variant, so I don't have to worry about that). If I read this line correctly, this changed flash chip issue is (only known to) occur in ISP-branded ones (haven't see an example of what those look like). So any normal/plain one should be fine?
Perhaps I can go on the BT Community forums. See what they think of AVM FRITZ!Box 7530 with OpenWrt.
I think reducing it to does fritzbox 7530 in bridge mode work with BT.
Can flash back to stock? I'd have to read the instructions.....
Then you can always go to the next case of using it in bridge mode and getting something else. VDSL2 sync has more to do with the proprietary vdsl firmware i'd think than anything openwrt specific?
I honestly do not know, as I stopped following this closely once I got my 7520 up and working without that patch.. so maybe ask in the vrx518 thread, or maybe @janh might be able to clear this up in this thread?
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