United Kingdom
If you are a solo traveller staying in London for a few days, taxis will prove very expensive. Buy an Oyster card and top it up with some money, then use it on any bus or tube/subway journey for half the price of paying cash. Cost is £3 (refundable deposit).
Any subway/tube station
If you're travelling from Heathrow into Central London or across London then opt for the Piccadilly Line as it's often quicker than the Heathrow Express, and cheaper too!
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