i've now, via extensive googling research ascertained that it is either 1992 or 1993 - BB prefix was definitely for a 1993 bike, but that bike was mtb - that bike has all the documentation with it year of manufacture etc, so did BB account for 1992 also possibly, maybe some crossover? A guy who has the same frame is pretty sure he purchased his in 93 as last years bike....
The 94 badge appears to not have the herons head top right, so one can assume that, they dispensed with the herons head for a second gen badge - 94 onwards.
I suppose the main reason to work out the exact year of a bike is so that year correct parts can be sourced so a catalogue correct spec can be achieved. Not everyone cares about that though.
I reckon 92/93 is probably right and more than likely 93. 92 was the first year for Titanium tubes but 93 was probably the earliest for the change to Dynatech head badges....................probably :?