Barcelona Circling Approach 2001?
In Autumn 2001 I flew as a passenger onboard a BMI Boeing 737-400 from Heathrow to Barcelona. When landing at BCN the aircraft appeared to conduct a circling manouvre. Looking now at a map of the airport, it appeared to track the ILS for Runway 20 then make a left turn to towards the south before making a quick right over some fuel storage tanks to line up with (what was then) Runway 25.
On the return flight for Heathrow there was a circling approach to (I think) Runway 23.
I was fairly young back then but since I've tried to read up on it but never found any information given that it certainly seemed fairly spectacular at the time.