That's more a pipe dream than a tactic.
Which parties do we designate as 'non-ultraleftist?' Surely, any political party to the left of Labour would be deemed to be ultra-left by the bourgeois state, its media and - more importantly - the Labour Party hierarchy and the bulk of its rank-and-file.
All attempts to allow communists to affiliate to the Labour Party have failed. The policy of the Socialist Party, during its incarnation as the Militant Tendency, to enter Labour in order to attain the very list of principles outlined by Neil resulted in purges and splits.
The one item that is missing from Neil's list is that such an alliance would have to declare itself as Marxist and advocate a revolutionary change in society.
The only way this will ever succeed is to persuade the electorate that this is what is needed.
It is not likely that the Labour Party will be the organisation to bring about such a change.
Jim Dymond
Aldershot