It would actually be pretty weird if Blinkin had never met a Jewish person. We have a few older answers about the Jewish community in medieval England:
u/CoeurdeLionne and u/mikedash examine the story of how the Jews of Normandy were invited to England in 1066
u/y_sengaku also looks at Why were there no Jews in England until after the Norman Conquest?
and I wrote about Why were Jews expelled from England in 1290?