There are different estimates for Salaries available online. Glassdoor provides a general overview of salaries for Data Scientists, StackOverflow provides a specific calculator, and several recruitment agencies provide salary estimates for different positions.
For instance, Harnham produces an annual salary guide for many data professions across the UK, several European countries, and the US. This is an exercise shared by Orange Quarter, and Wyatt Partners. Storm2 provides an estimate of tech salaries for fintech companies. While BigCloud specifically focused on a report of Data Science salaries across Europe. Other recruitment agencies such as Robert Walters, Darwin recruitments, or KDR Recruitment have also published Data Science salaries.