UPDATE 3-Rentokil turnaround on track but shares fall

* Expects "further quarter of good delivery in Q4"

* Q3 underlying pretax profit 49.6 mln stg, up 82 pct

* Revenue 623 mln stg, down 3.2 pct at constant currencies

* To detail growth strategy in Feb. 2010

* Shares down 7 pct

(Adds detail, updates shares)

By James Davey

LONDON, Nov 6 (Reuters) - British pest control to parcel delivery firm Rentokil Initial (RTO.L) said its five-year turnaround plan was gathering pace as it posted an 82 percent increase in third-quarter profit and forecast more progress in the balance of 2009.

However, shares in the firm, whose businesses also include cleaning and the hiring out of uniforms and tropical plants, fell 7 percent as investors booked profits on concerns over the outlook for 2010.