Carrentals.co.uk
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Not recommended.
I booked a pickup at Paddington station, but after I had made the payment the booking stated Euston as the pickup location. I rang the helpline who insisted that it was my fault (I am completely sure that it was not) and said that they could neither amend nor cancel the booking as it was less than twenty four hours until pickup. The only possibility was to make a second booking. A refund for the first booking would be at their discretion. I would advise you to use a different booking agent.