* Sees 340 mln stg H1 revenue contribution from COVID services

* Sees order intake in H1 at nearly 4 bln stg

* CEO eyes labor market as UK and U.S. furlough scheme ends

June 30 (Reuters) - Outsourcer Serco said on Wednesday it expects first-half profit to jump over 50%, bolstered by its COVID-19 services for the British and Australian governments, but said those revenues would ease in the second half.

The company, which has been supporting Britain's COVID-19 test-and-trace program with services such as test site operations, cleaning, security and contact tracing, expects underlying trading profit of between 120 million and 125 million pounds ($173.05 million).

Serco, whose roots go back to 1929, has been led by former British Prime Minister Winston Churchill's grandson Rupert Soames since 2014 and employs over 55,000 people globally in defense, transport, justice and immigration sectors.

The issues that Serco and the broader world face include labor shortages. Soames said it was difficult to hire lorry drivers in the United Kingdom and workers in the custodial business in Australia, where the group has seen the tightest labor market.

"I think that it's going to be very interesting to see as the furlough scheme ends in the UK and in the U.S.. In the U.S., the labor market is pretty tight but we're not entirely sure how that is going to work through," he told Reuters.

Soames has led the group through a turbulent time for the outsourcing industry, which in recent years has seen the collapse of Carillion and Interserve, and now faces Brexit and pandemic-related disruptions.

Order intake at Serco, which this week extended the COVID-19 testing contract, will be nearly 4 billion pounds in the first half, a record, it said.

The company, which this month raised its annual profit target by 15 million pounds to about 200 million pounds, kept 2021 outlook unchanged on Wednesday.

About 340 million pounds of its first-half revenue, which is estimated to be around 2.2 billion pounds, will come from its COVID-19 work, compared with 80 million pounds a year earlier.

($1 = 0.7223 pounds) (Reporting by Yadarisa Shabong in Bengaluru; Editing by Subhranshu Sahu and Barbara Lewis)