Travel & leisure stocks are going well, with mobile gaming software specialist Probability leading the sector higher.The firm said it is trading in line with expectations following a 'very encouraging' December that saw record bets taken and net gaming revenues 30% higher than November.Also in betting, bookies William Hill and Ladbrokes benefit from broker comment, with Cazenove upgrading the former to 'out-perform' from 'in line' and the latter from 'under-perform' to 'in line'.Among larger stocks, cruise operator Carnival is buoyant as the oil price falls back. Shares in Britvic are looking a bit flat ahead of the Tango maker's first quarter trading update tomorrow. Fellow soft drinks group AG Barr also helps keep the beverages sector in the red.Top performing sectors so far todayPharmaceuticals & Biotechnology 8,862.51 +0.89%Travel & Leisure 4,223.69 +0.77%Tobacco 25,159.57 +0.72%Food & Drug Retailers 4,764.47 +0.67%Household Goods 6,254.87 +0.49%Bottom performing sectors so far todayIndustrial Metals 4,801.74 -2.70%Forestry & Paper 3,786.13 -1.95%Mining 20,348.43 -1.60%Electronic & Electrical Equipment 1,580.58 -0.97%Beverages 7,738.79 -0.91%