* First-half pretax profit up 10 pct at 44.1 mln stg * Revenue rises 0.2 pct * Raises interim dividend to 2.35 pence from 2.23 pence * Says Australia business returns to profit Jan 29 (Reuters) - PZ Cussons Plc, the maker of Imperial Leather soaps, reported a 10 percent rise in first-half profit as growth in the United Kingdom and Asia offset tough trading conditions at its key Nigerian market.