On the very infrequent times I get back to the uk, I've occasionally tried such things, be it from Asda or Sainsburys, Morrison etc. They serve a purpose, no doubt, fast, easy microwave / oven cook, but ultimately for me, never satisfactory. I've tried a few frozen and refrigerated versions here in the US too but meh. I'm going to see if we have an option for 'onion masala' in our local Indian grocers, see if I can find a pre-made base gravy.
Robbo