OP - did the couple (that arrived/landed on a later flight) reach the boarding gate before you did? Or, in other words, were they allowed to get on the flight to Manchester after you were not allowed to?
This is a critical factor since all airlines have a set time (x mins prior to departure time) when they shut the door. It really doesn't matter where you arrive from or what airline you flew to connect there if you arrive after the cut off time.
If they allowed one but not the other (both, after the cut off time) then you have a valid argument.
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