Regarding Pax and Dr Dave above,
The resolution of the Hadley Centre Regional Models is 0.44*0.44 lat lon. These models are currently available for a European window, and I think over the Indian Subcontinent as well. The resolution of the global scale models is 3.75*2.75 lat lon, which gives effectively ~7000 grid cells, of which there are around 19 atmospheric levels, and 20 oceanic levels. To give some idea of how this translates into reality, the UK is taken care of by only 6 grid boxes.
All is not lost though for regional climate scenarios - there are a number of downscaling techniques which are available and effective (some of which I have used in research) to resolve the scale mismatch between the output of global climate models, and the needs of the climate change impacts community