Britain's FTSE falls as health stocks weaken

* FTSE 100 closes 0.3 pct lower

* Moody's cuts outlook on global pharma sector

* Inmarsat (Other OTC: IMASF - news) falls on outlook

* Admiral rises to record highs after results (Recasts, adds detail and updates prices)

By Kit Rees

LONDON, March 3 (Reuters) - Britain's top shares index slipped on Thursday, as weaker healthcare stocks weighed on the market, taking the shine off a rise in insurer Admiral.

The blue-chip FTSE 100 index closed down 0.3 percent at 6,130.46 points. The index is down around 2 percent since the start of 2016, and 14 percent below an April 2015 record high.

Healthcare stocks such as GlaxoSmithKline (Other OTC: GLAXF - news) and AstraZeneca (NYSE: AZN - news) fell after credit rating agency Moody's cut its outlook on the global pharmaceuticals industry.

Shares (Berlin: DI6.BE - news) in Whitbread - the company behind Premier Inn and Costa Coffee - fell 6.2 percent after a weak fourth quarter performance, while a cautious outlook hit the shares of satellite group Inmarsat.

Insurer Admiral Group was the best performer on the FTSE 100, rising 9 percent to record highs after posting better-than-expected results. .

Aerospace engineering group Rolls Royce (LSE: RR.L - news) also rose 5.3 percent, lifted by a price target upgrade from investment bank Jefferies. (Additional reporting by Tricia Wright; Editing by Toby Chopra)