"All seems a bit 'Irish' to me......"
What do you mean by this exactly???? B757's are catagorised as "Heavy" Aircraft when considering wake turbulence. Thats probably why Ryanair AND other operators ask for 2 mins. I'm an ATCO and whenever take off clearence is issued to a medium behind a heavy I think its good airmanship to just caution the medium a/c that a B757 has just departed. I always take into consideration the space a medium may need behind a 757 when deciding whether or not to give clearance to line-up.