Starbucks, Lakeside

Is there a true and valid reason why a drink that costs $3.05 in Abacoa, Florida should cost £3.05 ($6.10) in Lakeside, Essex? The drinks menu was identical to the one I see every day in Jupiter, FL only the currency signs had changed. Suzy Orman says the first thing you should do to save money is cut out that coffee habit.... In the UK at least, I agree!