Sources and references
Sources and reference dates
We prefer direct sources such as public authorities, manufacturers and official documentation. Changing rates, prices, rules and specifications include reference dates and sources. We explain what the evidence means instead of merely collecting links.
Limits
Tax, health and contract guides provide general information, not personal diagnoses or guaranteed outcomes. Published specifications are distinguished from our own measurements, and unmeasured performance is labelled as such. Check current official sources and seek qualified advice where personal facts matter.
Corrections
Report incorrect numbers, broken sources or changed rules through the contact link below, including the article address and supporting evidence. We correct material errors in the existing guide and update its review date.