U.K.’s FTSE 100 rallies, boosted by banks, GSK By: MarketWatch May 28, 2013 at 04:49 AM EDT U.K.’s FTSE 100 index returned from a long weekend with solid gains, catching up with advances seen in Europe the prior day and overnight gains in Asia. Read More >> Related Stocks: Astrazeneca Plc ADR Barclays Plc ADR Gsk Plc ADR HSBC Holdings Plc ADR Lloyds Banking Group Plc ADR Rio Tinto Plc ADR