If your going to Sparkbrook then Uncle's Home Store on Ladypool Road is your best bet for all that kind of cookware. They also sell the original balti dishes (the ones you can cook in that all the local balti houses use) which are now in very limited supply. There's some great shops for spices along there too such as Raja Brothers.
Personally speaking. I once bought a tawa and found that my naans burnt stuck to it and never really got into it. The best thing I've ever used, for a number of reasons, is a large De Buyer B Element frying pan. Far superior to a tawa in my opinion but that is just my experience.
MM