Aggressive pre-Christmas discounting by UK retailers desperate to woo the consumer is expected to negatively impact profit margins, according to the Financial Times as short sellers continue to target the sector. Companies covered include: Next Plc (LON:NXT), Carpetright (LON:CPR), Home Retail Group (LON:HOME), Marks & Spencer (LON:MKS) and Ocado (LON:OCDO).