Tue 09 Sep 2007FTSE rebounds on N Rock guaranteeBritain's top share index rose today, outperforming other European markets, as the British government's pledge to guarantee all deposits held by Northern Rock spurred a rebound in battered financial stocks.By 8.35am, the FTSE 100 was up 0.7 per cent at 6,223.7 recovering from a 1.7 per cent fall in the previous session. French and German markets were flat to slightly lower.