Battery Backup Unit

[#1]

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@TR11Falmouth wrote:
Does the supplied cable / adaptors connect ok to the Plusnet SmartHub v2 and the Openreach ONT ?

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Unfortunately not, you need adapters. 'Standard' 5.5mm outer diameter barrel connectors come with a dizzying number of pin sizes. 

BT and Plusnet hubs use a non standard 5.5 x 3mm barrel connector. They are available see https://toothbrushbattery.com/buy/bt-smart-hub-home-hub-dc-power-plug-adaptor/. I have read of brave souls managing to jam a 5.5 x 2.5mm connector in, but would not recommend trying.

You will also need one for the ONT,  The ONT connector is 5.5 x 2.1mm.  These adapters are readily available

[#2]

Although not directly related to this thread here's a guide on power backup.

https://www.thinkbroadband.com/guides/how-to-stay-online-if-uk-experiences-rolling-power-cuts

Brian

[#3]

@bmc 

An excellent article, It's a bit lengthy but includes all the salient facts relating to the best way to provide back up power tor a router and ONT during a power cut.