Atrial fibrillation

Bob is married and has two grown up sons. He is retired from the banking sector, but is still keenly involved in motorsport. Ethnic background/nationality: White British.

Chris is married and retired from his job as an electronics engineer in the aerospace industry. Ethnic background/nationality: White British.

Dave is a consultant engineer who frequently works abroad. He is divorced with three adult children. Ethnic background/nationality: White British.

David is a civil engineer and works as a delivery and compliance manager within the communications industry. He lives with his wife and has two grown-up children. Ethnic background/nationality: White British.

Dot works full time as an academic with management responsibilities in a university. Ethnic background/nationality: White British.

Eileen is a retired nurse who is married with two adult children. Ethnic background/nationality: White British.

Elisabeth is a retired nurse who lives on the most northerly inhabited island of Britain. She is widowed. Ethnic background/nationality: White English.

Freda is a retired administrator and married with two grown-up children. Ethnic background/nationality: Japanese.

Gail is a retired GP and counsellor. She is married with two grown up children. Ethnic background: White British.

George is a retired teacher and lives with his wife. They have two grown up children. Ethnic background: White.

Glyn is a warehouseman. He is married with three children, including a teenage son with special needs. Ethnic background/nationality: White British.

James is a surveyor and lives with his wife. He has one grown-up child. Ethnic background/nationality: White British.

Jo is a retired nurse. She is married with one adult child. Ethnic background/nationality: White European.

Pauline is a retired housekeeper and lives with her partner. She has two grown-up children. Ethnic background/nationality: White British.