It is lawful for a person in contemplation or furtherance of a trade dispute to attend—
for the purpose only of peacefully obtaining or communicating information, or peacefully persuading any person to work or abstain from working.
If a person works or normally works—
his place of work for the purposes of that subsection shall be any premises of his employer from which he works or from which his work is administered.
In the case of a worker not in employment where—
in relation to that dispute his former place of work shall be treated for the purposes of subsection (1) as being his place of work.
A person who is an official of a trade union by virtue only of having been elected or appointed to be a representative of some of the members of the union shall be regarded for the purposes of subsection (1) as representing only those members; but otherwise an official of a union shall be regarded for those purposes as representing all its members.