UPDATE 1-Arriva says soft UK rail to hit H1 results

* Transport group says rail revenue growth slowed

* Results elsewhere in the group in line with forecasts

LONDON, June 30 (Reuters) - British rail and bus operator Arriva (ARI.L) said slower revenue growth at its key UK rail franchise CrossCrountry would weigh on first half results, although the rest of the group had performed as expected.

The company, which runs transport groups across Europe, said in a statement CrossCountry revenues grew 2.4 percent in the six months to end June, but would need full year growth of 10 percent to maintain 2008 profit levels.

"The group results for the six months will reflect the lower revenue growth rates in CrossCountry, and are otherwise expected to be broadly in line with management's overall expectations," the company said.

Arriva shares are down more than 30 percent this year, and closed on Monday at 423.25 pence, valuing the business at nearly 820 million pounds ($1.35 billion).

(Reporting by John Bowker, Editing by Ben Deighton)