1 Exhibit 21.1 SUBSIDIARIES OF REGISTRANT Diamond Cable (Bassetlaw) Limited Diamond Cable (Burton-upon-Trent) Limited Diamond Cable (Chesterfield) Limited Diamond Cable (Grantham) Limited Diamond Cable (Grimclee) Limited Diamond Cable (Hinckley) Limited Diamond Cable (Leicester) Limited Diamond Cable (Lincoln) Limited Diamond Cable (Lincolnshire) Limited Diamond Cable (Mansfield) Limited Diamond Cable (Melton Mowbray) Limited Diamond Cable (Newark-on-Trent) Limited Diamond Cable (Ravenshead) Limited Diamond Cable (Vale of Belvoir) Limited Diamond Cable Acquisitions Limited Diamond Cable Communications (UK) Limited Diamond Cable Communications Plc Diamond Cable Construction Limited Diamond Cable CPE Limited Diamond Holdings plc Diamond National Networks Limited Diamond Visual Communications Limited East Midlands Cable Communications Limited East Midlands Cable Group Limited East Midlands Cable Holdings Limited Jewel Holdings Limited LCL Cable (Holdings) Limited LCL Telephones Limited