UK news followers, how would journalists find out what overseas hotel a celebrity and their family are staying at, if booked privately?

Uk hotel empliyees are not well paid and employment is casual. Add to that delivery people, support providers, drivers etc and it's hard to keep confidential.

It's probably fairly easy:

- Following them,

- listening to or even encouraging incautious gossip by other guests or indiscreet hotel staff,

- the family itself letting slip their accommodation.