BRITISH engineering giant Rolls-Royce is facing further delays in solving problems with its Trent 1000 engines which led to aircraft groundings.

Shares in the FTSE 100 firm slumped in early trading after the company warned that a reduction in the number of grounded aircraft to single digits would be set back until the second quarter of 2020.

The company said it accelerated the replacement of immediate pressure turbine blades for some engines, which led to additional engine removals and delayed the firm's progress.

The news is a fresh setback for the Derby-based company which has been dogged by problems with the Trent 1000 engines which first led to the grounding of Boeing 787 Dreamliner planes in 2018.

Issues with the engines helped to drag the company to a loss last year and soured relationships with a number of major airline customers.

The company's chief executive said earlier this year that the number of aircraft affected by the engine problems had declined to between 30 and 40 in the first quarter of 2019.

It was expected that the company would reduce the number of grounded aircraft to single digits by the end of 2019.

Last month, the company said it faced an additional £100 million charge over the next three years to tackle the issues, on top of £1.5 billion of previously earmarked costs.

Rolls-Royce added that its guidance for the cash costs of the in-service issues in 2019 and 2020 is unchanged from what was announced by the firm in April.

Shares in the company were 3.1% down at 785p after early trading on Friday.

The planned merger between online mattress store rivals Eve Sleep and Simba will not go ahead, the companies have said.

Last month the pair confirmed they were in discussions about a potential deal but on Friday Eve revealed bosses "decided that now is not the right time to pursue the potential merger".

The company added that "it is more appropriate to focus on the Eve rebuild plan... overall trading has been more challenging than previously anticipated owing to the uncertain economic outlook and continuing low levels of consumer confidence".

In contrast, Simba suggested it no longer needed a new partner in Eve, revealing the company is now operationally profitable in the UK - something bosses had previously thought would happen sooner with a merger.

Steve Reid, Simba chief executive, said: "Simba has transformed its business in the last nine months, cementing our position as Europe's favourite mattress brand.

"Globally, our partnership with Sleep Country Canada continues to be a success, with a further collaboration confirmed in China through The Beast offline stores. We remain focused on achieving bottom line profitability and business efficiency."

Both companies updated the market on current trading as they announced the end of their courtship.

Eve revealed overall trading has been difficult because of the "economic backdrop combined with heavy discounting and promotional activity", adding sales in 2019 are expected to be between £25 million and £27 million.

The company added that losses are still expected to be reduced due to "optimising overheads and operational costs".

Shares had been suspended following confirmation of the talks with Simba but were readmitted for trading on Friday morning.

At Simba, bosses said they were finally operationally profitable in the UK market, with 4% of the UK mattress market.

Around 750,000 sleep tech products have been sold since the business was launched, and its busiest day to date was the August bank holiday, with sales of £2 million, the company said.

Bosses also completed a £10 million fundraiser.

Both businesses have struggled previously in a tough market. Simba was forced to slash its valuation from £200 million to around £20 million in February to secure new growth funding.

Meanwhile, Eve had seen its share value slide due to an over-expansion in Europe after floating on a £140 million valuation. It is now valued at around £13 million.

In January, chief executive James Sturrock tapped investors for £12 million in funding to refocus on the UK, Ireland and France.