We boarded on Friday...was late on (flight delay, baggage delayed, last bus from airport etc) so just got on board. Went into Tenerife today and picked a few things up - security was done by the port and they didn't blink an eye. Once on ship there were no questions asked at all.
Problem is, I've now had to request a bigger fridge for the 44 cans of beer and 7 bottles of wine we've brought on!