Thankfully a very rare problem for us, but that is more by luck than by judgement.
Any problems have tended to materialise in the first few weeks. Any7 weak points are going to go pretty soon with all the pressure fluctuations during a 24 hour day. Pressure in some areas can spike at night to quite alarming levels.
No point losing sleep over it. Just be aware of where your stop cocks are .
Phew as long as any problems are apparent sooner rather than later. I'm in the process of redecorating the whole flat so I don't want to be in a position where it all comes undone later on down the line.
I think maybe they checked the bath taps for leaks but forgot to check shower!