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