A humanised agonistic antibody which binds human PD-1 comprising a heavy chain and a light chain wherein the variable domain of the heavy chain comprises the sequence given in SEQ ID NO:1 for CDR-H1, the sequence given in SEQ ID NO:2 for CDR-H2 and the sequence given in SEQ ID NO:3 for CDR-H3 and the variable domain of the light chain comprises the sequence given in SEQ ID NO:4 for CDR-L1, the sequence given in SEQ ID NO:5 for CDR-L2 and the sequence given in SEQ ID NO:7 for CDR-L3. The invention also extends to therapeutic uses of the antibody molecules, compositions and methods for producing said antibody molecules.