I won't be able to do any testing until I get back to my office. Currently at sea.
IIRC for the UK I would expect to see 5GHz channels ranging from 32 to 173.
The Beryl regularly detects networks running on channels below 96. Occasionally detects networks on channel 100 and on only once detected channels above 100.
This would be in contrast to the Opal which shows all active channels.