My youngest grandson played throughout last season in an U13 Division of the Junior Premier League.. Not in any game, home or away, as far as I am aware was an official appointed by the league. Most certainly, at every home game the official was appointed locally. In this sense my opinion of the JPL is low.
However, to be fair, there are so many Divisions spread far and wide across the country that logistically a central Ref Sec would be almost impossible to administer and regional or divisional Ref Secs impractical. (My grandsons age group had 23 different leagues/ divisions, ranging from the south coast to north Cumbria).
Suggest that you perhaps try to contact the manager of a team in the JPL, register your interest with him and see if he can provide any contact details. (The JPL website has very little information).
Hope this may be helpful.