Since October 2008, all pregnant women in England have been offered a screening test for sickle cell disease and thalassaemia.

http://www.patient.co.uk/health/planning-to-become-pregnant

Screening tests

Since October 2008, all pregnant women in England have been offered a screening test for sickle cell disease and thalassaemia. Some women may wish to have the screening test before becoming pregnant, especially if their family origins make these diseases more likely. See your doctor to discuss this.