For the first time in his life, Derek has decided to conceal his Jewish skullcap - known as a kippah - when out in public.
"I went shopping yesterday and bought a baseball cap," says Derek, who lives in Edgware in north London and did not want to give his full name. "I never wear a baseball cap.
"I felt that to go on the underground, as a religious Jew, was just too problematic."
Every Friday night, Derek and many other Jews across the world mark the end of the week by ushering in the start of the Jewish sabbath - Shabbat. Families light candles and gather around the table for Friday night dinner, sharing the comforts of food and conversation. On Saturday morning, they go to synagogue, to pray and reflect on the week that's just passed.
This Shabbat is no different. The candles were lit. The synagogues will be busy. Yet at the same time this weekend the ritual will feel different for every Jew in Britain.
