Dartford must treat Alan Dowson’s return to Princes Park as just another game. That’s the view of his successor, Ady Pennock, as Darts prepare to host Hemel Hempstead on Saturday. Dowson was sacked in January with the club 16th in National League South, 10 points clear of the relegation zone, having finished runners-up in his first season in charge. They’ve since dropped into the bottom four with caretaker boss Tony Burman unable to turn their form around and Pennock losing his first three games. Dowson was named Hemel manager until the end of the season a fortnight ago, offering his services …