Posted July 30th, 2014, 08:39 AM
Last edited by John Bull; July 30th, 2014 at 08:40 AM
As Ray's answer, Cunard is the only line which offers fairly regular trans-Atlantic crossings - New York to Southampton. It's one of the more formal & traditional lines.
Other ships do offer occasional trans-Atlantics "re-positioning" cruises, normally to Europe in the Spring & the other way in the Fall, as they switch from a winter season in places like the Caribbean to bases in the UK & the Mediterranean for the summer season. That won't work both ways with one vacation, but mebbe a re-positioning cruise one way & a Cunard crossing the other way.
Because of time, cost, & other limitations, most folk fly across.
Plenty of cruise lines offer round-Britain cruises, probably best if you tell us your friend's budget & preferences (luxury, formal, family, party-atmosphere etc) & we can suggest the best bets, rather than explain the differences between cruise lines.
All round-Britain cruises include Scotland & Ireland, most also include the Channel Islands & some include ports in France & even Norway. All round-Britain cruises are port-intensive, so longer cruises include more ports than shorter ones - it's as simple as that.
Strangely, many don't include ports in England - but England is where most sail from, so if for instance your friend has two weeks then the ideal would be a 10-day cruise with a few days in a hotel in England (most choose London).
BTW, cruise lines often quote "London" as the departure port
That can be Southampton, Harwich or Dover - and all three are 60+ miles from London in different directions. So if your friend chooses a trans-Atlantic cruise & a round-Britain cruise, do check out the actual departure ports rather than assume they're all one place.
Anyone who looks like their passport photo is too ill to travel (Will Kommen)