Actually, it looks to me like the Exclusivity Period expires on 6th April 2006.
The Circular to Shareholders dated 5 August 2005 concerning Biotec says, in the section of Material Contracts, on page 43 :-
The Agreement with ASDA is dated 23 March 2005 between (1) the Company and (2) ASDA Stores Limited ("ASDA") (the ADSA Agreement"), whereby the Company grants ASDA certain exclusive rights in relation to its Greenseal tray lidding technology (the "Technology"), within the food sector within the UK and Ireland for a period of 12 months and 14 days from 23 March 2005 (the "ASDA Exclusivity Period").
That document to Shareholders contains a wealth of information that dispells many of the myths, scares, ramps and deramps that get put about. It should be required reading by anyone wishing to buy or short shares - or even before they post on a BB !!
I certainly pay more attention to it than the greater part of what we read here !