I ended not using my ticket in either direction. For the departure, I missed the 3.30AM service and so the next was not until 5 AM. So I ended up taking a taxi. I was told this is due to shortage of drivers. For the return, I waited for a bit at Heathrow coach station - which is a bit of chaos. Then decided to use the Elizabeth line train instead for it being quicker. So ended in not using the coach tickets.
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