The strike will now take place between Thursday 18 June and Wednesday 1 July.
Journalists at the titles are being faced with redundancy or a pay cut as part of a cost-cutting drive which will a number of senior roles disappear and 16 weeklies placed under a single group managing editor.
The union said in a statement: “Facing the possibility of a legal challenge, after the company raised a technical issue with the original strike notice, the chapel has decided to reschedule rather than have the dispute overshadowed by legal arguments.
“The union is confident that the company’s objections to the original notice were without basis.”
The South London chapel is demanding 3pc salary increase and a rethink on the restructuring proposals.