Background to it is that the trial of an election petition normally has to be held within the constituency concerned - which was why Saddleworth Town Hall was commandeered for the petition there. The judge can move it if it has to (and was done with the Tower Hamlets petition because of concerns about witness intimidation). However if there is a 'special case' in which the facts are not in dispute but the law is, then it must take place in the Court of Session (or High Court for England and Wales). It's not clear from the report whether the issue was over whether to hear the petition as a special case or just moving the venue itself.
What Stuart Hill was doing is anyone's guess.
Socialism makes war upon a system, not upon a class