Bathtub water level alarm

[NickFitz]

Here's another: Flooding Sensor Alarm - Alzheimer's & Dementia Products Ltd

[doodab]

Why not rig up some sort of ballcock contraption?

You can get buzzers from Rapid or farnell, rs etc. Probably maplins too if you want it today and have one nearby.

[OwlHoot]

Why not rig up some sort of ballcock contraption? ...

Oh I already have them, They're handy for alerting me if the water is too hot when I get in

[Clippy]

KUATB

That looks perfect for SY01 to attach to his bed.

[vetran]

Nova-flo

[TimberWolf]

Anyone else not had a bath in years?

I like the ballcock idea. You could use the one from the toilet on a bigger lever as long as you also take the water supply from the toilet.