revision in a mail centre -questions?

[patrickstar]

hi
could a union rep please confirm something for me.if management introduced a mech and manual resign for early shift in sept 11 where everyone signed into and just 3 months later now management are discussing a business plan change for 2012/2013 and therefore another resign ,do the workers have a right to stay in their jobs and stay on their signed duties.management impose a rule where you must stay in the job for one year.can we therefore not use this against them if they are planning more changes?

now they are proposing to remove all of our mech duties from earlies and put them on nights with no mech duties left and only manual work remaining after such a short time of them being in place?

thanks