The Scots knew that victory over Cheltenham Spartans would leave them in the clear, even though Bridgefield could finish level on points (Portobello beat Bridgefield 14-8 when they met at the start of phase two).
In the event, it was a fairly straightforward exercise. Portobello won 15-8, with Neilson Rutherford, Mario Alvarez, Fraser Rutherford and Hadrien Collinson all notching hat-tricks. The match marked the retirement of Cheltenham's David Edwards (see Edwards Calls It A Day below), who signed off with a couple of goals in the final quarter.
Portobello withdrew a team from the League's top division after 2014/15 and re-entered with a new-look, younger line-up last season, when they won Championship 4. Their only defeats in this campaign were against York and Castleford.
Later, Bridgefield raced into a 5-0 lead on the way to defeating York 14-10 - and claiming runners-up spot.
As happened in Championship 1, the last match of the season offered a winner-takes-all promotion spot for the winners. The honours went to Castleford, who beat Otter 17-10, led by seven goals from the division's top marksman, Luke Franks.
Spare a thought for Otter. They began the final weekend with a one-point advantage at the top of the table - and ended in sixth place! Such has been the competitive nature of several divisions in phase two of the season.