Sorry - yes indeed, Gib was the intended destination. Racking my poor little PPL brain, the only real thing I can think of was the plane with its return fuel load would be too heavy to land with what ever technical problem there was (undercarriage?). In that case it would make sense to return home (to base), and land with the lower load rather than jetisson fuel or hang around somewhere near spain for the load to reduce sufficently to take a more local alternate and still have passengers who could not get to their holiday.
Is this possible?.