There is no way to sugarcoat Jaguar Land Rover’s latest set of financial results. In the final three months of 2018, balance sheets will record the company made a pre-tax loss of £3.4 billion.

Granted, that eye-popping number is inflated by a one-off non-cash charge of £3.1bn. But even if you discount that as an ‘exceptional item’, it’s tough reading: a pre-tax loss of £273 million, compared with £90m in the previous financial quarter.

Whichever figure you choose to focus on – £3.1bn or £273m – neither is positive. And both, in different ways, lay out the challenges Jaguar Land Rover faces in the coming years.

The one-off £3.1bn non-cash charge effectively comes from Jaguar Land Rover adjusting down the value of some of its capitalised investments, such as factories and machinery, effectively recognising that money it has previously invested in them won’t be recovered.

It is understood a number of those investments relate to the production of diesel-engined cars, which have long made up the bulk of Jaguar Land Rover’s sales. That has left the company particularly vulnerable to the slump in demand for diesel, which, right or wrong, seems increasingly to be an irreversible trend. By reducing the ‘carrying value’ of its capitalised investments, Jaguar Land Rover says it will save around £300 million annually in deprecation and amortisation.

Effectively, this is Jaguar Land Rover trying to draw a line under past mistakes by taking one big hit, preparing the firm to move forward under its ‘Charge’ and ‘Accelerate’ turnaround and transformation plans. Through those plans, Jaguar Land Rover is targeting more than £2.5bn worth of savings, which we already know includes the loss of 4500 jobs, this year.

Jaguar Land Rover is also investing in the future; in the final three months of 2018, it invested £1bn, including funding for an engine manufacturing centre to build electric motors, and a battery assembly centre. Both will be located in the UK and help the firm’s plans to offer an electrified version of every model in its line-up from 2020 on.

So it is possible to spot some positives, but the challenge the company faces in staging a turnaround is highlighted by that £273m pre-tax loss in the last quarter. For Jaguar Land Rover to stage a recovery, first it has to halt the decline.