Overview of X-ray laser research in the UK por Lewis, C, Keenan, R, MacPhee, A, O'Rourke, R, Tallents, G, Eker, G, Lin, J, Pestehe, S, Smith, R, Wark, J, Wolfrum, E, Zhang, J, Pert, G, McCabe, S, Simms, P, Burge, R, Browne, M, Charalambous, P, Neely, D, Collier, J, Danson, C