The Cockcroft Institute is a newly created international centre for Accelerator
Science and Technology in the UK. It is a joint venture between the Universities of
Lancaster, Liverpool and Manchester, and the Science and Technology Facilities
Council. The Cockcroft Institute has a large expertise base in Wakefields and
Impedances which is linked through the Cockcroft Institute Wakefields Interest Group.
Members of this group have experience in wakefields in linear colliders, ring colliders,
light sources as well as generic fundamental research and focus on a wide range of
specialist areas. In this article we summarize the work performed in this important field
of research at the Cockcroft Institute