Make sure when booking your transport you consider that the cheapest is not necessarily the best value for money. A professional company will be correctly licensed by VOSA, would be more than happy to share any documents such as Insurance, MOT certs, DBS checks. Please do not assume that the authorities check these things all the time.
Remember that you as the lead passenger are the person that would have to live with a potential breakdown or accident that could be life changing.
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