StockMarketWire.com – Gambling group William Hill made £335m of operating profit in 2013, versus £330.6m in 2012. The prior year included 53 weeks and the unaudited 52 week operating profit in 2012 was £326.4m. The Group’s effective tax rate benefited in the year from a deferred tax credit following an enacted reduction in corporation tax rates hence the substantially lower pre-exceptional tax charge, which at 11.5% was 5.0 percentage points lower than the prior year (2012: 16.5%). Against this, amortisation of specifically identified intangibles arising on acquisition was higher as a result of the Sportingbet acquisition and pre-exceptional interest charges…