They have 6 different mixer taps, you have to state which one.
You need either a new O ring in the shower or tap anew washer in the tap, or you should go to the toilet before showering.
If by o ring you mean the ring on the plastic cap that allows you to access the filter, than nothing but remember to do it next time.
close it with a valve wrench, change the o-ring
Ring a Ring o' Roses was created in 1881.
'O' refers not to the shape of the ring but to the ring's cross-section.
Depends on what type of o-ring it is.
There are various answers to this. Firstly check if no hairline cracks are evident. Secondly it depends whether its a tap or a mixer. The gland nut on the tap could leaking or the o ring in the mixer could be finished.
Ring o' ring o' roses
O Ring for what component.
by double tapping
automatic tap changing transformers can change their tap setting on their own, manual tap means a person has to manually go out and change the tap setting