“Because it’s a gearbox, the turbine can run very fast, much more efficiently, the fan can run slower and be much bigger,“ explains Simon Burr, a director at Rolls-Royce.

It builds gearboxes in Halewood and is in the final stages of creating a major new facility for producing motors for electric vehicles on the site.

The 31-year-old ship returned from the Cammell Laird shipyard in Merseyside last month, but before it could carry passengers again, a new gearbox fault was detected which required several more weeks to fix.

The voyage date was shifted when problems arose with its rudders and gearbox.

But until 30 September, it was stuck in Belfast due to problems with its rudders and gearbox.