For teams in promotion positions it is very unfortunate for them that they miss out following a “Null and void” scenario. However there is no way that any contrived solution is going to be fair to each and every Club.   

Liverpool fan Jeremy Ruane, understandably desperate for the Premiership season not to be declared null and void, suggested the following as a way of completing the season. 
He said  “May I suggest applying a 0-0 scoreline for all games still to be played so you end up with a complete league table."  

I had not heard of this contrived solution so I applied it to our league and this is the resulting final league table : 

                                         Pts 
           1   Leek                  82
           2   Stamford           79 
           3   Cleethorpes      66
           4   Belper Town      61
           5   Carlton              60
           6   Stocksbridge     55
           7   Sutton Cold.      54
           8   Kidsgrove          50
           9   Frickley              50
          10  Ilkeston              49
          11  Sheffield             48
          12  Loughboro. D     48
          13  Worksop             44
           !4  Glossop              41
          15  Chasetown         40
          16  Spalding             40
          17  Newcastle           36
          18  Lincoln Utd         36
          19  Market Drayton   28
          20  Wisbech              27 

With each team getting a single point for each of their outstanding fixtures, the placings in the final league table of actual matches played is not disturbed too much but at the same time the 0-0 contrived results are not realistic meaning some teams lose out and some gain.
For instance Sheffield with 11 games left and 8 of them at home would have expected to pick up more than 11 points.