Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,182
It's not a given that you were IDB.
Although annoying if you were HBO and made it to your gate in time, your arrival flight probably didn't arrive before MCT. And since that airline is unlikely to be an EU/UK airline, you won't be covered by EC261.