you do not describe it too well,it does not matter about the two way switching arrangement,all that matters is the ceiling rose connections,what you have is a loop in loop out system,connect one of the wires from your light(brown) to the block of two,as you put it,and the blue wire from you fitting to the black connections,fit earth wire (if fitted on light fitting to earth connection)be sure to turn the power off,not at the light switch,but at the mains,as in an loop in loop out system there is always a live in ceiling rose even when the switch is off,hope this helps
mm, December 2010