I’ve taken both the regular services and the Express. There is no point at all in taking the Heathrow Express as it’s often offered for free when other services are delayed and even then it’s not worth the few minutes of saved journey time. After I was charged a transaction for Heathrow Express despite using the correct barrier to access the Elizabeth Line, the customer service of the Heathrow Express refused to refund the money which shows irresponsibility.
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