and over time our taste does become dulled. I can now nibble on fresh red habeneros and I often complain that a restaurant vindaloo is too mild
"Dulled" SnS?

I'd be surprised if actually actually got any left SnS! ;D
Funny thing is, I also fondly (?) reflect upon those Yung Chow Fried rices and spring rolls spewing oil!....yum!....and that Whitbread Trophy and Tankard tops....ha!

I think you make a good point SnS. However I'm not sure I can totally agree.
I agree with SS, in part. It seems that times are a changing, and not necessarily for the better for many people, like SS, me and many others. I think the BIR scene HAS largely changed, for all manner of reasons:
Increased competition. Not necessarily from other BIRs, either, but from other "fast food" outlets, pubs, sandwhich bars, etc. This can lead to cost cutting, and selling to a price, and hence lower quality.
Increased health awareness and regulation. For instance, less oil, no recycled oil, "healthier" oils. You said yourself that the Saffron does not use MSG. Sorry, but its use was ABSOLUTELY STANDARD in BIRs and Chinese takeaways in the 70s and 80s (....together with the cats and dogs, no doubt!

). Who wakes up now, in the middle of the night, with a raging thirst? Who can smell the curry permeating the skin? Not I! And who's witnessed the proliferation of "MSG free!" chinese takeaways?! I avoid them like the plague, but that's why I'll probably die young!
I'm sure there are many other reasons too.
But I KNOW I've had recent curries with the exact taste and smell of the 70s and 80s. I've had many crappy ones too, and not just the ones I've cooked myself!

So, that's where my opinion differs, I disagree that it's gone in ALL the BIRs, just from many. Then again, I've never eaten curries in the London area so I dont know the particular story there.