The Footsie is nestling comfortably above 6,000 but its advance is no thanks to the banks, which are friendless on a resurgence of worries about Greece.Fears that the credit ratings agencies will regard the latest rescue plan for Greece as a default in all but name is putting the wind up holders of banking shares.Standard & Poor´s (S&P) has warned that the voluntary rollover proposed by the French government and accepted by banks for 70% of Greek debt could be considered a "selective default." The ratings agency affirms that the decision "will result in investors receiving less value than that promised by the original securities." S&P adds that "the two financing options outlined in the FBF (Federation Bancaire Francaise) proposal would likely amount to a default under our criteria."Real estate investment trusts are wanted, led by British Land, which is higher on the back of a "buy" recommendation from Deutsche Bank.Broker Killik has also pitched in with an upbeat note on the sector. Killik's Jonathan Jackson says: "Companies with prime assets in attractive segments will be able to deliver continued NAV [net asset value] growth."Top performing sectors so far todayChemicals 7,735.48 +1.88%Technology Hardware & Equipment 773.47 +1.55%Real Estate Investment Trusts 2,354.73 +1.44%Oil Equipment, Services & Distribution 25,823.39 +1.39%Beverages 10,032.55 +1.33%Bottom performing sectors so far todayBanks 4,500.27 -0.25%Health Care Equipment & Services 3,797.71 -0.12%General Retailers 1,711.49 -0.11%Real Estate Investment & Services 1,763.29 -0.09%Alternative Energy null 0.00%