Is there any reason why a Flint 2 used in the UK would have the Country Code set to DE?
I've changed this in Luci to use Great Britain 'GB'
I'm assuming this has no real effect as we still use European WiFi standards?
imho there are differences between EU and GB especially in the 5GHz channels.
Using the wrong country-code may cause huge problems with the authorities.
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United Kingdom
The UK's Ofcom regulations for unlicensed use of the 5 GHz band is similar to Europe, except that DFS is not required for the frequency range 5.725–5.850 GHz and the SRD maximum mean e.i.r.p is 200 mW instead of 25 mW.
Additionally, 5.925–6.425 GHz is also available for unlicensed use, as long as it is used indoors with an SRD of 250 mW.
List of WLAN channels - Wikipedia
What DE does:
Germany
Germany requires DFS and TPC capabilities on 5.250–5.350 GHz and 5.470–5.725 GHz as well; in addition, the frequency range 5.150–5.350 GHz is allowed only for indoor use, leaving only 5.470–5.725 GHz for outdoor and indoor use.
Since this is the German implementation of EU Rule 2005/513/EC, similar regulations must be expected throughout the European Union.
European standard [EN] 301 893 covers 5.15–5.725 GHz operation, and as of 23 May 2017 v2.1.1 has been adopted. 6 GHz can now be used.
So by setting the MT6000 to DE, GL are covering selling the MT6000 in Europe, what's causing a problem is that in the UK, DFS is not required for channels 149 to 165 on 5Ghz and the srd should be 200 mW not 25mW as in Germany, plus Apple devices will complain if the connected router is not transmitting the same Country Code as neighbouring routers
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Thanks for the reply @hecatae I'd read a little about this on the link here: WiFi's Dirty Little UK Secret - Urban Haze
So, changing to GB is something that should be done?
Missing Channels
I've noticed both in the UI and Luci that you can't select any channel past 128 on the 5GHZ
@bruce @admon - Can you advise at all as to why channels 149-165 on 5Ghz aren't available when Country Code is set to GB?
Sorry, I can't help with that.
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I get that, but channels 149-165 are not available?
Of course not available in UK.
But they should be available?
Channels 149 to 165 are available in the UK, without DFS.
@Jbennett360 I can only get 149 to 165 working if I choose 80 Mhz for the 5Ghz radio
Wrong country?
I was only using 80Mhz width and mine wasn't showing anything after 128.
Tbh, I've just been plagued with Wi-Fi issues from the off. Had more this afternoon too, connected with no Internet, slow speeds again.
I've boxed it up and it's going back.
I want to like it, but the reliability just feels really bad. It's a shame!
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That's a huge disappointment 
I do not own the MT6000, I have a couple of MT3000, two B3000, two b2200, X2000 and 4 SFT1200s.
I can get the 149 to 165 channels working on all the above.
did you try a reboot?
Yep.
- Tried a reboot
- Tried changing back the country code to DE
- Tried a factory reset without saving settings
- Tried flashing the latest FW
All producing the same results.
It is disappointing because the coverage on this thing is incredible and it means I don't need an Extender/Access Point configured elsewhere. But at the same time, I value reliability over anything and this clearly struggles. 
Have you tried the op24 firmware?
https://dl.gl-inet.com/router/mt6000/open
Tried previously, Yes. Still had issues with Wi-Fi
In that case, OpenWrt seems not to support the special UK Wi-Fi regulations.
Sorry, meant Ive had the WiFi issues with OP24.
I haven't specifically checked for channels in OP24
It does, but it seems the mt6000 doesn't 
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That would be weird on the open firmware because the OpenSource driver is used.