Here's what my company ops manual says!
If the mean value is below the type specific limitation or max demonstrated
value but the gusts exceed it the aircraft Commander must use his
judgement as to whether an approach or departure is prudent.
But it also says:
The maximum demonstrated crosswind component for take-off and
landing is 30 kts measured at tower height of 10 m (32.8 ft). The
demonstration was made with both engines operating on a dry runway
and using VREF plus half the maximum gust intensity. This value is not
considered to be limiting.