Thanks, but I do feel that the headline was reasonable given it's use of the word 'could'. By the given account, shipping prices have been rising dramatically recently and remain on an upward trajectory. It is also reported that shipping companies are reluctant to steer ships into UK ports for fear of delays caused by congestion - I think he probably will have good knowledge of that.The trouble is the article is not all facts but opinions extrapolated from facts.
It is a fact that shipping prices could rise, and probably have risen, significantly but price rises of 300% (for white goods and staple foods) is outside the shipping company's expertise and is an opinion.
There is no need to exaggerate the problems that Brexit (in this case allied to Covid) will cause with a headline saying 'could'. They may as well write 'could or could not' rise by 300% but that would not give the East Anglian Daily Times the chance to get a scoop over the FT.