Bath Taps and Bath Overflow

[stl]

Hi,

I am wanting to tighten up the bath overflow bit (that is connected to the chain with the bath plug on it) that is just below the taps on the bath, but can't find a screw or anything on either side. Does anyone know how to tighten these up?

Also, I am looking to replace some taps and want to purchase a flexible hose to connect the new taps to the copper pipe. They are advertised with a BSP size. Anyone know how to relate this to the taps I am looking to install?

Thanks

 

[ChrisR]

Oveflow typically has a big nut on the back

Bath taps are usually 3/4" bsp, though some imports designed for high pressure are 1/2" bsp.
Confusingly that's the INSIDE diameter so they look the next size up, at first...