If the light has an earth make sure you connect it to the earth wires...
The Two blacks together are Neutral - the Blue wire of the lamp should connect to these
The single Black on its own is Switched Live (i.e. Live from the switch that comes on and off as the switch is operated) This wire should connect to the lamp's Brown wire.
In an ideal world the Single Black (switched live) should have a red or brown sleeve on it for identification - to show that it's not a Neutral even though it may look like it.
Good luck... Take care...
Peccavi
November 2009