Carrying on from Colin thoughts, re Leaks.
It is amazing how many people, mainly Visitors or Renters don't put the shower screen to the inside of the bath roll, or Shower Screen / Curtain inside the bath.
Some will only wash their hair over a basin and with eyes shut are real splashers!
Some Visitors are used to Wet Rooms or have Sealed and Tiled upstairs Bathroom Floors.
Suddenly we are at home or it is a Bank Holiday or we call a Carpet Fitter to change the lino (or similar) floor covering and it is soaking wet trapped underneath the floor covering. So very occasionally no leak at all, or at worst as Colin says a worn out Screen seal, or Bath seal.
Leaks on Hot Water Pipework - Older UK Systems with A Header Tank / Cold Tank
After you turn off the Cold stop valve (stop tap) clockwise usually near the Water Meter (if you have a water Meter inside, some on newer meters are quarter turn valves) and if you have an older UK plumbing system with a Header Tank or Cold Feed Tank (mainly in the roof) that feeds an older Hot Water Cylinder / H/W Tank, you will need to drain the header tank by opening the hot taps when the leak is on H/W pipework, otherwise it will continue to leak until the Header Tank is empty - Older UK Plumbing Systems, sometimes known as Gravity (Low Pressure) Hot Water Systems.
Electric Shower
I try, if I remember to pull my Electric Shower cord off and turn the Shower setting to Cold and run the Shower Cold when turning the water back on after being away (sometimes it can stop the Electric Shower overheating until the air is purged/pushed out, when turning the main stop valve/tap back on).
Electrics
If in doubt regarding any electrics or the possibility of hidden electrical wiring / junctions under the floor being wet or in the wet area, it is a good idea anyway to SWITCH OFF the Main Electrical Consumer Unit / Fuse Box, especially whilst investigating or working with a water leak or unexplained wet and dampness.
Think Safe and Be Safe!
Mark