Hi JerryM
It's interesting what you say about the salt. I find that to get a decent BIR flavour I have to add a decent amount of salt to the curry I'm making. But the problem is that when I taste the curry the next day (cold) it's far too salty, and yet I don't notice this when I first eat the curry hot!
I think MSG must play a part in this and I'll probably try some, with an appropriate reduction in salt, in the near future to assess its effect.