If one is aggrieved by a decision of the District Court in Criminal matter what does he do?

A person aggrieved by a decision of the District Court in  Criminal matters can appeal  to the High  Court as per  section  359(1)  of the Criminal  Procedure Act.                                                                                                Note: the procedure in appealing  to the High  Court is governed by section 361  of the  Criminal  Procedure Act.

The procedure is;  the appellant  must give  notice  of intention to appeal  within 10  days from the date  of the findings, sentence  or order.  And in case  of a  sentence of a  corporal  punishment  only,  a notice  of intention to appeal  must be  given within 3 days from  the date of such sentence; see  section  361(a) of  Criminal  Procedure Act.  And the appellant  must lodge his petition  of appeal  within forty  (45)  days from the date of the findings, sentence  or  order. 

Note: Also that  the appeal  by DPP  against  acquitted, finding, sentence  or  order  passed by subordinate court are governed by section 378  of the  Criminal  Procedure Act, thus;         

a).  DPP must  give  notice  of his intention to appeal  with 30  days of the acquittal, finding, sentence or  order  against  which  he wishes to appeal; and

b).  he  must lodge  his petition of appeal  within 45  days  from  the date of such acquittal, finding, sentence  or  order.