I take it you don't mean Fry's Five Centre?
Poor old Bounty! It was CADBURYS that made Milk Tray Bar, not TERRYS! However, I may be able to solve your problem. Years ago, Milk Tray included a chocolate called lime barrel. It was barrel shaped and contained a liquid lime centre. It was wonderful. Now, the reason why you may not think the bar you are remembering is a Milk Tray bar is because there were TWO versions. One was milk and therefore called Milk Tray bar but the other was plain and called Plain Chocolate Assortment but the middles were the same fillings.
Get it?
I can remember a chocolate bar from my childhood that had a number of centres but not Terry's Milk Tray bar, I don't think??? Each segment was a different shape fused into one tablet. One of them had a lime flavour filling. Can anyone remember this, or was it just a Milk Tray Bar and I'm going wappy?
I remember Milk Tray Bars by Cadbury. They had eight different centres and I wish they would bring them back. I last had one about 25-30 years ago.
Debs