Ed may be the best person to answer this, but any input from others, based on experience, would be welcome. The standard advice for Americans is to rent or at least reserve a car before leaving home in order to save money. But I am considering a one- to three-day rental in Britain -- in the unlikely event the March weather cooperates. How much of a premium is attached when you walk up to a counter once you are in-country, as opposed to reserving the car in advance.
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