I can't see a serious issue here. The FRA should check whether a fire alarm system is being suitably tested and maintained and that should pick it up. That is if the premises actually needs a fire alarm system.
If the premises does need a fire alarm system and these are installed to deceive the fire authority then the offense is failure to provide an adequate means of raising the alarm etc.
In all seriousness these are sold as a joke and will probably appear in student housing as that.
Mike, is there not the issue that someone looking for an mcp during a real fire might try to 'operate' this sticker? Not everyone knows what a real a mcp looks like and works like. If BS recommends that sounders operate within 3 seconds of the operation of an mcp to avoid panic then what happens when some unknowing persons tries pressing the sticker during a fire situation, but nothing happens, they then panic and leave the building without raising the alarm properly?
I'm all for a bit of fun, but I think the manufacturer of this product is taking a big risk in being the cause of a tragedy.