Courtesy of Rick Stein's French Odyssey on BBC2 last night I finally got a definitive answer to the question - and yes you do pronouce the T at the end! I had always thought of NP as just another dry vermouth, but when you realise what goes into it you cannot help but be tempted to give it another try:-
"In order to mellow the dry and full-bodied nature of the blend of white wines, the Maître de Chai then adds a dash of muscat mistelle (grape juice and alcohol) and to accentuate its fruity flavour, a tiny dash of fruit essence (raspberries and lemons).In the oak casks, with a capacity of 2,000 litres, a subtle blend of around twenty different plants and spices are macerated directly in the wine for three weeks, -a process unique to Noilly Prat- which is the secret of its exceptional and delicate taste.The plants are added by hand each day for three weeks: this is the process known as maceration."
They have a very funky website, including audio which will show you how the makers pronounce the name - plus recipes - Mr Stein has a favourite fish recipe using Noilly Prat - see their website at www.noillyprat.com
