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What are the next steps I can take?
Connect a laptop directly to the router, see how the speed varies.
If it's consistent there then you can rule out the internet connection and it's down to the wireless.
If the speed is still flaky via a network cable then call BT and when you're on the phone don't mention WiFi at all, tell them that you only have 1 device and it's connected directly via a cable to their modem, so that they can't fob you off.
geriatric internetz, dangerously ill informed user...desperately trying to not loose my job.
Have been forced to relocate to my folks. Internet connection is BT Fibre, through their NGA ECI-CPE modem type 1B to an older Apple TimeCapsule.
iStumbler suggests Wifi signal in the -35 to -63dBm around the house, with ~95 dBm noise on an entirely free channel. Detached house so minimal other networks to compete with (6 others on another channel). No microwave. Conclusion: Wifi network seems to be fine.
Testing through speediest.net gets me similar speeds on 3 different macs and iPad. With VPN and without VPN. Conclusion: devices are getting consistent connection.
Problem is the speed fluctuates from 30 mbps (what dad has paid for - suits his email needs) and about 0.01 mbps. Any ideas why? What are the next steps I can take?