For the UK, basic rules that cover residency for most are listed at <https://www.gov.uk/tax-foreign-income/residence https://www.gov.uk/tax-foreign-income/resid

For the UK, basic rules that cover residency for most are listed at <https://www.gov.uk/tax-foreign-income/residence https://www.gov.uk/tax-foreign-income/residence>, with a link to the full rules for those not covered by the basic rules.