Yes, Boost originally was a coconut bar in a red wrapper. It was only when they relaunched it that other flavours - biscuit and peanut to begin with - appeared, if memory serves. The original Boost in the red wrapper is my favourite chocolate bar of all-time! The newer flavours just aren't anywhere near as lovely.
I've written to Cadbury's a couple of times and they were more positive in their response last time, post-Wispa comeback, so fingers crossed. There IS a petition online to bring back the original flavour if you do a quick search - please sign it! Also, an internet search tells me in Ireland they call Boost 'Moro,' and this summer they had a special Coconut Moro as a limited edition! Doh! If I'd known, I would have booked myself a ticket to the Emerald Isle and stocked up... Are there any Irish sweet shop websites that sell them, I wonder?