Best answer by MrSmart
Hi Everyone and thanks
I don't believe there's anything actually on the meter that says 'I'm a SMETS2', just been looking through my catalogue of meter pictures and none of them do anyway.
There is, however, one big giveaway difference between SMETS1 and SMETS2 and it's the communications hub.
Generally, in my experience, the comms hub for SMETS1 is either part of the meter itself (and therefore not visible as a separate device) or, in the case of L&G meters, has a smaller, thinner device somewhere nearby (probably from Trilliant) which provides the remote communications.
In SMETS2, the communications hubs all look similar in that they're big, square boxes that should sit on top of the electricity meter and will have a number of barcodes on them. Another key giveaway is that the meter will have a Meter Serial Number (which everyone is used to and knows and loves) but it will also have a 'GUID' or a Device ID which looks like this: AA-BB-CC-DD-EE-FF-00-GG-ZZ.
The comms hubs also have several LED lights on them in a row which will indicate whether it's connected to WAN, gas, Mesh network and HAN. SMETS2 comms hubs will also have a 'SKU' label on them - SKU1, SKU2 (but that's only for the Central and South region).
So, many giveaways actually, if you know what you're looking for