UK case, ATC shall apply the time seaparation for VORTEX WAKE, but can use a little bit of anticipation too, below from MATS 1
9F. Departures
9F.1 Wake turbulence separation minima on departure shall be applied by measuring airborne times between successive aircraft. Take-off clearance may be issued with an allowance for the anticipated take-off run on the runway; however, the airborne time interval shall reflect a difference of at least the required time separation.
Therefore, even in Dubai, I hope you will not get a clearance that means less than the required minimum time between departures.