Capital Gains by INDIVIDUALS, such as the sale of your shares in the company, are to be filed/paid as follows :-
Gains 01/01/2006 - 30/09/2006 :-
pay tax by 31/10/2006 file return by 31/10/2007
Gains 01/10/2006 - 31/12/2006 :-
pay tax by 31/01/2007 file return by 31/10/2007