The stability behaviour of the flame produced in a typical nozzle where the fuel supply (kerosene or natural gas) is sandwiched between two turbulent swirling air streams has been studied. The double swirler is co-rotational and the injector is a pre-filming airblast atomizer using pressurised kerosene. The results show principally two different shapes of flame, depending on the ratio of the inner mass airflow to the outer one (mu). if this ratio is less than its critical value (mu(c)), this shape is observed to be U-shaped, otherwise it is inverted conical; this applies for the gaseous fuel as well as kerosene. The value of mu(c) depends on the swirl numbers of both inner and outer airflows. Better stability is obtained for the U-shaped flame. Preheating of the inlet air leads to wider stability limits mainly due to the rise of the turbulent burning velocity. The kerosene spray flame shows stronger dependency of the lean blow-off limits on mu and better stability than the gaseous flame burning at the same conditions. Detailed measurements of the size of the droplet, and its velocity and volume flux at each location within the spray plume, were made for the two forms of flame, using a newly developed non-intrusive lightscattering dual-phase Doppler particle analyser. The results show that the distribution of liquid flux and the flame form are closely defined by the flow field of the atomizer. The data reported herein are part of a database being accumulated on this spray flame for the purpose of detailed comparison with numerical modelling.