Deep-water drilling could take place at hundreds of sites off the British coast after MPs ruled out a moratorium, despite concerns that the work could lead to a disaster worse than BP's oil spill in the Gulf of Mexico.  Following the Deepwater Horizon accident last year, the energy and climate change committee was asked to look into the risks of drilling in deep water off Britain. Oil companies have said plans for deep drilling off the Shetlands could cause a spill worse than the Gulf of Mexico disaster.  But Tim Yeo, the committee chairman, said Britain's energy supplies and national security depended on the new oilfields.  He said safety procedures could be "tightened up" but on the whole the industry was safe: "I think the concerns are nothing like big enough to justify stopping the process."  Ben ayliffe, of Greenpeace, said that Health and Safety Executive figures showed an increase in serious accidents and spilt oil at British rigs.  "They are pressing ahead regardless of the holes in their own regulatory system. It is like they have learned nothing from the Deepwater Horizon spill," he said.