Bryan Wallwork (aka Wazza) is a frequent poster to the newsgroup and has a wide knowledge of Indian recipes.
 Although his personal preference is for the "pukka" recipes he has devoted some time to devising
 recipes which will produce dishes in the style of UK Indian Restaurants.
These recipes do include spice mixtures (masalas) which Bryan prepares himself from freshly ground spices,
 you will find recipes for 
curry powders and 
garam masalas
 on this site.
Restaurant Style Curry Recipes