TP-One B to Hive Mini Single Receiver

[FSmith87]

Morning all, currently switching my TP-One Thermostats to a hive system, I have successfully replaced the TP-ONE M thermostat with a Hive Mini and dual receiver but I'm now having some issues with the TP-One B.

The existing set up looked as following

Further to that there was a grey cable behind the wall, which I have followed other guides on here and connected to the N port on the Hive receiver, having done this I'm not appearing to get any power to the receiver, can anyone advise where I have potentially gone wrong in the image below

Any help is greatly appreciated

 

[CBW]

No good just connecting the grey without confirming it’s connected at the other end, will likely explain the power issue. Also, whilst the earth/cpc is there, it’s better connected into the terminal.