Hi Natterjack,
I've done this loads of times and I used to just throw everything in there and wait for 2-3 hours. Yes the results are not BIR, but if you're making a lamb or beef recipe they come out ok.
However, having practiced with this over the last couple of years, I have found that if you "seal the beef or lamb" first in a hot pan, then make the curry sauce as you would normally do, then add it all to the slow cooker along with the meat, you will end up with a basic curry but quite bland.
Because you need to add a little water to almost cover the meat this is where it can go wrong as the water dilutes all the spices that you have cooked.
I usually, chop an onion and fry it till it is golden and soft, then add another 1 tsp of each. Spice mix, curry powder, which ever one you are using, chili powder, fresh chili's, then some stock, either chicken or beef and just cook that down to a thick stock, then blend it into a smooth mixture.
Then add it to the slow cooker and then cook it for 2-3 hours or whatever setting you put it on until the meat is tender.
It still won't be BIR, but it will create a wonderful thick sauce with mouth watering meat that just falls apart in you're mouth.
At the end, about 15 minutes before serving if you want to add freshly chopped coriander and garam masala then do so to you're own taste.
I would put this in between BIR and traditional home Indian cooking, but the results are endless if you want to play with this....

I've created some wonderful Bhuna/Madras/Curries this way and served with some simple plain boiled rice, vegetable dishes and breads to create a fantastic meal.
This way if you are working, you can prepare the night before or in the morning if you have time, put it on, go to work and come home to a wonderful meal
