[SES]

The still developing night fighter air defence system was closely monitored and reported upon thanks to ULTRA.

And as I said, even with a complete intact telephone system like in Denmark, much communication of operational and tactical nature was still conducted via landlines and W/T simultaneously.

In the last weeks of the war some operational HQs were more or less constantly on the move and albeit they endeavoured to move to a location with good landline connectivity, W/T was still used to a large extent.
bregds
SES