Not sure what a fantail is exactly but if it is at the back of the ship with a balcony then you're in for a treat - the views are phenomenal (especially if you're doing the Panama Canal) and the balcony is usually larger.
Southampton : Gijon : Bilbao : Cherbourg : Paris (Le Havre) : Southampton
Now from £579pp
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Southampton : Lisbon : Valencia : Cartagena : Gibraltar : Seville (Cadiz) : Southampton
Now from £599pp Was £639pp
Southampton : Guernsey : Cork : Dublin : Hamburg : Rotterdam : Brussels : Paris : Southampton
Now from £999pp Was £1329pp