BBC: BP has fixed a problem with the cap on the leaking Gulf of Mexico oil well, which delayed a crucial test. Work on starting the test, which was due to begin on Tuesday, has resumed. The oil giant needs to shut all the valves on the new cap in order to test the well’s integrity. If the test is successful the flow of oil could be halted until relief wells can stop the leak permanently. The government’s incident commander Thad Allen said “hopefully” the test would …