Lunair,
You will find that for a Single Bleed Fault there are now 2 MEL entries, one stipulates NO FL Limitation if Speedbrakes are operative and one stipulates a limit of FL315 if Speedbrakes INOP. All due to the certified time to reach FL100 with and without speedbrakes.
In the case of the MEL limit on NWS, if you have this fault after dispatch there is NO requirement to reference the MEL, so if the 20kt limit is not mentioned on the ECAM / QRH / IFLD etc then it doesn't apply. Of course a prudent pilot would probably have a look at the MEL even after dispatch and may well decide the prudent course of action is to land somewhere with less than 20kts crosswind.