Regarding brexit how will that impact on the central corridor routes?
Nobody knows, is the short answer. A lot depends on what brexit looks like. We can however look at some hypothetical
situations. (I'll try to wear my neutral hat
At present the UK relies a lot on agriculture in particular from Ireland (North and South) as well as other imports. A significant (and increasing) amount of trade from the North also moves through the central corridor. Slap on tariffs (and customs checks, etc) and it no longer makes sense for that trade in particular to move through Dublin over say the routes straight from Warrenpoint and Belfast to England. Then theres traffic from Ireland bound for the continent - if it faces checks and duties leaving Ireland and again when leaving the UK, Ireland to France could see a lot of growth. It is not unusual for traffic from NI to pass through Dublin and the UK mainland bound for France either - that could potentially get very expensive!!! (I have some numbers later on in this rather lengthy post)
If, however, the trading and customs relationship between the UK and Ireland remains more or less the same there probably wont be much effect. It is also worth taking into account that people still need to eat, and the UK can only supply so much of its own food at present, so in all likelihood will still rely on importing food (which will be more expensive to buy so there would likely be some effect on volumes).
Everything depends on what the politicians negotiate and what concessions both "sides" are willing to give. Of the 28 EU countries, the UK and Ireland probably have potentially the most to lose from Brexit IMO.
Anyway, here some numbers from a quick google search (and so I am relying on the analysis of the website - I'm no economist!).
of all food exports from Ireland go to the UK. Of the 60% of Irish exports that go to the EU, over a quarter (16% of total Irish exports) goes to the UK
. For comparison 5% of all exports go to France, the only other direct passenger ferry destination (and a significantly longer route in terms of time taken to the other biggest EU destinations listed below than passing through the UK, as would direct services to say Zeebrugge). Surprisingly to me, it seems Belgium is the second largest EU export destination for Irish goods (14% of all exports), followed by Germany (7% of all exports). The US is the largest export destination for Irish goods, despite Ireland being bound by the same EU rules that brexiters claim are holding the UK's own exports to the US back [my neutral hat slipped off for a second
]! (stats taken from http://www.tradingeconomics.com/ireland/exports
). On the flip-side, the same website says some 34% of all imports to Ireland come from the UK http://www.tradingeconomics.com/ireland/imports
), so it is very much a two-way trading relationship which both countries stand to lose a lot from.
In summary, Brexit may have little or no impact on the central corridor routes. Or it could have a significant impact (and not just on the central corridor either). Sorry for the long post!