Start with cash flow, not property price.
The better first question is not the biggest loan you can technically get. It is the monthly repayment you can carry while still keeping emergency cash and lifestyle commitments intact.
DSR is the bank language.
Banks review income against existing commitments and the new mortgage instalment. Your actual approval still depends on income documents, credit conduct, property type and bank policy.
Use calculators as the first screen.
A calculator gives you a fast working estimate. A proper eligibility check should still compare bank treatment, documents and the latest package terms.