Pull what wrote:
Swansea is an Air/Ground facility so it may well be that whoever is using the radio is also involved with other duties and may not have been able to answer your call and you should not expect the same response time from A/G as from AFIS(in my opinion)
...which misunderstood the OP. However, since it was mentioned, may I disagree strongly with the opinion about AGCS units. If an AGCS unit is notified, then the service is to be provided during the published hours of operation - and that means answering calls!
2 s