Interesting, s the spec sheet you found suggests 7530 AX comes with BCM63178 SOC which is on some models also like the new ASUS DSL-AX82U and is a 3 core 1.5GHz cpu (very nice)
@Grisu is the resident AVM expert and hopefully he sees this, I had a look and could not find a 7530 AX International Version which would have been suitable for UK ?
The Intel (Infineon) tend to sync slightly lower than Broadcom chipsets as they have a better error correction rate, but at the cost of synch
I have purchased my last Fritz!box from Spain and they supplied UK 3 pin plug, so maybe have a chat with supplier, Ideally you need the 7530 AX International Version, which is not available but it seems the 7530 AX does support English Language I believe 
http://ftp.avm.de/fritzbox/fritzbox-7530-ax/deutschland/fritz.os/info_de.txt
http://en.techinfodepot.shoutwiki.com/wiki/Broadcom/SoC
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Produkt: FRITZ!Box 7530 AX
Version: FRITZ!OS 7.21
Sprache: Deutsch, Englisch, Französisch, Italienisch, Niederländisch, Polnisch, Spanisch
Release-Datum: 09.12.2020
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In a completely sane world, madness is the only freedom (J.G.Ballard).
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