Without looking, the difference between the two model numbers is likely that one with the P has a passthrough adaptor as the non WiFi unit (you can insert a mains plug into it) and the other doesn't....

To be precise - it's 3.2.4b - release 170628.

Just upgrade one then swap them over. They don't have to both be upgraded to work. If you upgrade over the network it seems to fail quite often and leave the device bricked. Then you have to use the...

Just for reference - was that the production 3.2.4 from TP-Link, or the beta version from these forums? nb - just in case you were not aware - the tp-link utility speeds have little relevance to the...

They should work across separate radial circuits from the same phase / fuse board, but crossing breakers often reduces performance...

The EU / UK should be interchangeable as regards regulations as both must comply with EU Directive (204/108/EC).