The Great White Turbine is the RR WR21 Advanced Intercooled Recuperating Cycle Gas Turbine, developed from the RB211 (I think) to produce a "flat" fuel consumption performance at part load at enormous expense by UK & US. So highly rated is the turbine that it was only put in the ship by the express intervention of Buffhoon, replacing the preferred GE LM2500+.
WR21 currently has an order book of 6 shipsets (12 units) worldwide. I wonder if anyone can guess which class that is. Word is that the recuperator is somewhat less than reliable and that the unit can only be run as a simple cycle engine. This would not be a problem, were it not for the diminutive size of the diesel generators fitted, which are both small in terms of output power and old (in that they're no longer supported by the OEM). Hence my bafflement at the allegedly impressive sea trial performance.......
WL - what you saw on Ark isn't Sampson......