I would like to back Jim and Ramos.
I crossed the Strait many times but only in summer and early september.
It is not a big deal, just watch the weather, the Strait is only a few hours crossing. Be sure that you are watched, by Spanish and UK Coastguard, although the Spanish are more fanatic than the British. However, when they see the little progress you make, they will take you from the list of suspects.
Suspected targets are the fast powerboats. And of course sailingboats with suspected flags
Watch the Levante at all times. If you are in Morocco
watch the cloudy and foggy air. That means that a Levante is coming within the next 24 hrs.