At the meeting last night, there was some discussion regarding the frailty of infrastructure.
Mike G6PTY brought to our attentiuon, a link setup between two UK 70cms repeaters which is not using the internet.
South Hampshire Repeater link
This is using a point to point Wi-Fi link between Southampton and Portsmouth (13 miles), and can achieve up to 100Mbps over this.
I am not sure which model of Ubiquiti kit they are using, but for referrence her is an exampe, of what they do:Ubiquiti Powerbeam for approx £100 per end