Thoroughly enjoyed this cruise.( even tho 2nd time of doing). We booked online but arrived earlier than anticipated. Circle line were very happy to let us get on an earlier boat - rare to be able to change tickets these days without having to pay extra for amended booking, admin charge etc etc.- full marks for customer service. Good commentary on board, plenty of seating. As advertised, saw all the landmarks and the cruise length (90 mins) was just right. Overall highly recommended.