Thanks to all who have answered my query.
Overall it is a bit of a weird one. I will expand my original post.
The village halls heating system is remotely controllable, currently only by me as I have the password. (There were some issues last year with remote control, but turned out that Siemens had not supplied their two modules at the village hall with compatible firmware. This resulted in being able to control the system with a pc connected to the BT Hub in the office wireless or cable, but not via the internet.)
Yesterday there had been a glitch in the local power, my cousin's wall mounted clock had stopped and was waiting for 12 hours to restart at the correct time. Once I heard that, from home found that I could not access the heating. I was going there for a meeting at 6:00pm and when I arrived the building was cold... Unable to access from office pc, so went down into the cellar and power cycled the control system, also power cycled the BT Hub. Access from the office pc returned.
When I got home, I needed to change the on/off times for the room we had used. No access from my home pc. Tried to ping the Hub (which I have done previously) no go.
This morning, access from my pc had returned and surprise surprise I can now ping from home.
Leaves me with whether I actually needed to power cycle the control system. Hence a means, via Android or BQM for monitoring would help in the future.
Thanks Pheasant for UptimeRobot looks interesting; I will try that out later. The Village Hall is currently ADSL, but should be OK.
I will also be looking at the Android option, hand when I am up in the Hall.
Thanks again all.
Cheers!
Clive
Andrews & Arnold Home::1 FTTC DrayTek Vigor 2762ac Cisco ATA191 for A&A VoIP together with a HUAWEI E5776 with O2 Data SIM