Britain's top share index rose on Monday, rebounding after its biggest weekly fall in over three years, as energy stocks bounced from multi-year lows to track the oil price higher, Reuters reported. Oil-related stocks gained after Brent crude rebounded from fresh 5-1/2 lows hit earlier on Monday. They added 21 points to the FTSE 100, accounting for most of the index's rise. The FTSE was up 39.81 points, or 0.6 percent, at 6,340.44 by 0908 GMT, after falling 6.6 percent last week.