When the Nazis came to power and life became restrictive for Jewish families, many sought refuge in other countries.  By 1939, more than 60,000 Jewish refugees had come to the UK.  
After Kristallnacht – a state sponsored pogrom which took place across Nazi occupied countries.  Jewish businesses were ransacked, looted and destroyed.  Synagogues were vandalised and destroyed and 91 Jews were murdered. 
10,000 unaccompanied children in Nazi territories between the ages of 5 and 16 were given refuge in the UK.  This was a unique humanitarian operation which became known as the Kindertransport
You can read more about Kindertransport and Refugees