I apologise for my post being a little misleading. The point I was making is that the roundtrip Business upgrade for the Silver dawn, Silver Wind, Silver Spirit and Silver Ray [all cruising in the same UK/ Northern European region at the same time in 2024 involving flights into and/or out of London] is approx.$A6,000 while the Business upgrade for the Silver Endeavour around UK is approx. $10,000.
Interesting that there is a $4,000 surcharge for Silver Endeavour.