Yes all the way to channel 167 if required.
AFAIK most if not all APs only support up to 140, as they were developed before Ofcom opened up Band C for unlicensed use. As I mentioned before, my Zyxel doesn't support Band C and their excuse was that few clients support it so there was no reason to update it to do so.
The real reason I believe is as Band C was opened up quite late, they would have to pay to have the devices tested on that range (to make sure they follow regulatory requirements) and they see no return on that investment. As these are business APs and a business is going to care more about wide client compatibility so likely not use Band C.
Its a similar situation to what we had with Band B when nobody wanted to pay the cost of supporting DFS so many older devices only support 36-48.
Hopefully WiFi 7 APs will have it by default, but I doubt Apple support it right now as they didn't even add WiFi 6e to their latest devices and only support 80Mhz channel width (though strangely the WiFi applet on MacOS does occasionally incorrectly say 160Mhz).
Also, I take it you're aware of how Band B works?
https://draytek.co.uk/information/blog/ofcom-relax-the-rules-on-the-5ghz-bandOn three of the allocated channels (channels 120, 124 and 128) it's considered that radar use is likely so your device must monitor for radar and wait 10 minutes with no radar detected before it can consider transmitting. This means that when you turn your AP on, you have no Wi-Fi for the first 10 minutes and every 24 hours thereafter.
DFS is not entirely reliable - it's subject to false positives (signals wrongly detected) and false negatives (signals not detected). This is partly due to the 'simple' nature of radar signals compared to Wi-Fi signals.
The effect of a false positive is that your Wi-Fi device shuts down unnecessarily, causing interruption to your connection. If that keeps happening, your connectivity becomes unusable as, once DFS has detected radar, that channel cannot be retried for 30 minutes. If there's a false negative, your device may transmit on a channel being used by radar, theoretically causing critical interference to it. There's a more detailed article on this here ( http://wifinigel.blogspot.com/2018/05/the-5ghz-problem-for-wi-fi-networks-dfs.html )
The good news, however, is that in 2020, Ofcom in the UK announced that the requirement for DFS will be removed on more channels. Specifically, frequencies in the range of 5725-5850Mhz (5.8Ghz) which correspond to channels 149, 153, 157, 161 and 165 will be allowed for indoor unlicensed use in the UK, without requiring DFS checks before or during use. Until now, these Group C channels have only been permitted for limited outdoor use in the UK, with licensing granted by Ofcom.
Note that when DFS is detected, a lot of APs will just drop to channel 36, which could explain why simply reconnecting allows it to work again. In theory it should try to switch back again after 30 minutes, but I've never seen that happen. My guess would be that some implementations consider that constantly losing WiFi for 10 minutes, every 30 minutes, would kinda be bad so don't bother trying.