There are no car ferries between Ireland and London. You must firstly establish from which part of Ireland you are travelling from and get to the nearest ferry port. Possible options are Cork, Rosslare, Dún Laoghaire, Dublin or Larne. Depending on which of these you travel from will depend on which ports you could go to in Britain. When you arrive in Britain, you will then have to drive to London which will be at least 150 miles and possibly more. Holyhead or Fishguard, both in Wales, are the best options to go to.
You can fly or drive to a port and take a ferry
Ireland is an island, as is Britain, where London is. To travel between the two, you could fly, but if you want to bring a car you would take a ferry across the Irish Sea to one of the main ferry ports in Britain like Stranraer, Liverpool, Holyhead of Fishguard and drive to London then.
Take a flight from any of London's 4 airports. British Airways, Aer Lingus, bmi, EasyJet, Ryanair and others all fly to Dublin. Takes about an hour. Or, much less convenient but prettier, drive from London to Holyhead in Wales and take a ferry to Dublin. The drive is around 4 hours, the ferry around 3.
There are no ferries from Northern Ireland to France. To get to France by ferry you would first drive to somewhere in the Republic of Ireland, particularly Rosslare, and get a ferry from there. The ferry takes about 24 hours, and the drive to Rosslare from Northern Ireland would take at least 3 hours, depending on where in Northern Ireland you were starting from.
You can't travel directly from Amsterdam to London by ferry because London doesn't have a ferry port. You would have to travel from Amsterdam to Hook of Holland by train (or drive), catch a ferry to Harwich and then take a train (or drive) to London.
By road or rail to a ferry port in France and then by ferry to Ireland directly or to England and by road or rail to Wales and then by ferry to Ireland. There are various routes you could take for the whole journey.
It depends on what method of travel you are using. A flight would take about 1 hour. If you are driving, around 12 hours including the ferry crossing.
The best way is to fly from one of London's airports to Dublin Airport. The other options are to travel across England to one of the ferry ports, like Holyhead or Liverpool, and get a ferry from there. Going that way would take a lot longer. You could fly in just over an hour, whereas going by land and ferry would be at least 8 hours.
The best and quickest way is to fly. There are various flights between London and Northern Ireland. A longer way would be to go by road or rail and by ferry across the sea. There are lots of ports that you could travel between, but it would take a lot longer than flying.
A car hire company in London might not let you take it out of the country. You would be best to hire one separately in Ireland.
London to Waterford is approx 370 miles.This includes a Ferry from Pembroke Dock to Rosslare.The whole journey will take at least 10 hours.
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