Go to Yahoo Finance
Yahoo Currency and use the currency converter for the days exchange rate. 100 pence make up 1 British pound. All London stocks trade in Pence. So currently if the stock is at 126 pence thats 1.26 Pounds. 2.3 USD if you convert at the given rate on Yahoo. Note you won't get that rate since your broker is going to screw you on Forex conversion. Also remeber that there is a 1 percent stamp duty on UK Stocks.