https://www.gov.uk/hmrc-internal-manuals/employment-income-manual/eim76361
EIM76361 - Social security benefits: statutory maternity pay: interaction with other maternity pay...
social security benefitsstatutory maternity payinteraction
https://www.gov.uk/guidance/statutory-maternity-pay-how-different-employment-types-affect-what-you-pay
Statutory Maternity Pay: how different employment types affect what you pay - GOV.UK
Find out about different rules for entitlement for some employment types like agency workers, directors and educational workers.
statutory maternity payemployment types