Agreed and further, I think, the blue and white wires were paired in the manufacturers original connector blockIt looks like (and this is at your own risk) Brown - Black.
Blue - White.
Earth - Green & Yellow.
The blue wire looks like a return to possibly allow a second lamp to be added, so I'd put it in a separate connector block.
This is only my opinion from tracing where the cables go in the fitting on the photograph.
It's a made in China fitting using hot and cold wiring references, but that blue is the odd one.
If in doubt get an electrician in who can test the unit.
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