hi hun,
my sisters a health and safety manager and shes on mat leave and was due to go bk p/t. they told her when she went for a meeting she would have to move to a lesser position and less money so she threatened to sue them for discrimination among other things as when shed gone on leave they had said she could go back to her job as normal. they have since relented and she goes back to her normal job p/t next week.
the only thing i could suggest is tell them if they dont adhere to the agreement that was already in place you are going to either sue or take to a tribunal (not sure of the system where you live). hun you dont need the stress you should be enjoying your beautiful baby not worrying.
HTH and take care hun, good luck.
rach xxxxxxx everything gets sorted.