Pilot: G-xx [....] intending to pass through D129, request Danger Area Activity Information.
Brize Norton ATC: G-xx R129 is active 24/7, however there is currently no military activity.
Pilot: Understand no military activity. Thank you for your help.
I would be very surprised if any ATC unit providing DAAIS used such ambiguous phraseology.
For an H24 Danger Area there will be a formal agreement as to how the DAAIS unit is advised about the status of the Danger Area. This will also provide authorisation for the DAAIS unit to advise when there is no activity and so allow pilots to transit the airspace.
The type of phraseology used will be along the lines of 'Danger Area 129 is not active' although some military units also like to use the term 'Danger Area 129 is cold'. In either case, it only signifies that the notified Danger Area activity is not taking place, it makes no statement about any other aerial activity which might be found in the confines of the airspace.