I’m not sure if they’re available with UK plugs, but I’ve got a pack of Thirdreality Zigbee plugs that monitor energy use and have a button on them to toggle power.
I’ve got them connected to Home Assistant. Two do a bit of climate control in a coldroom, the others are for occupancy lighting.
This is quite important with Immich. They’re good at documenting their breaking changes, just gotta make sure you check the changelog before updating. Also best to avoid auto updating with Watchtower or similar to avoid surprises.