Thanks for the replies!
chevvron, have you got a reference for those figures?
BOAC, the problem is with EMA ATIS which is same freq as CDG so cannot get the wx and runway till halfway down descent. It's not so much the wx thats the problem but the Rw in use when the wind could favour either runway which means less time for monitoring during descent if we have to rebrief and reprogram the FMC etc in accordance with company procedures.