Good point Leo, I did find it hard to find consumption stats for the Tapo P110's that I have, found them for US-type plugs easily enough but not UK-type.
Same, I eventually found some details on a user forum!!
Under the Ecodesign regs, most household devices sold in the EU must use less than 0.5W on standby, network connected devices can use up to 8W until next year when they must also meet the 0.5W limit. Smart plugs may still be a good idea then if you can control multiple devices via a single smart plug.