Retailers are in decline over worries that shoppers may not be able to reach the stores to spend money because of the snow. Next is the largest faller with Marks & Spencer also down on the day. British Airways has been hit by cancelled flights and the closure of airports. Oil services provider Petrofac continues to rise after Friday's trading statement. National Grid has confirmed that there is enough gas to meet the new all-time high in demand. FTSE 100 - RisersPetrofac Ltd. (PFC) 1,548.00p +2.31%Diageo (DGE) 1,202.00p +1.86%Royal Bank of Scotland Group (RBS) 38.52p +1.85%Essar Energy (ESSR) 587.50p +1.73%National Grid (NG.) 561.50p +1.72%Invensys (ISYS) 356.90p +1.62%BT Group (BT.A) 185.30p +1.59%Carnival (CCL) 2,803.00p +1.41%RSA Insurance Group (RSA) 125.80p +1.37%Schroders (Non-Voting) (SDRC) 1,417.00p +1.36%FTSE 100 - FallersNext (NXT) 1,955.00p -1.51%Autonomy Corporation (AU.) 1,521.00p -1.43%Marks & Spencer Group (MKS) 370.40p -1.33%British Airways (BAY) 267.20p -1.11%ARM Holdings (ARM) 391.20p -0.71%Associated British Foods (ABF) 1,127.00p -0.53%Randgold Resources Ltd. (RRS) 5,590.00p -0.45%Whitbread (WTB) 1,799.00p -0.33%Sage Group (SGE) 275.20p -0.22%United Utilities Group (UU.) 584.50p -0.17%