On-call changes to t&c?

[Ginni]

I manage a care home and have been part of an on-call rota which includes just two other very similar care homes with whom I work closely. Last week I was told, out of the blue that some time in Feb the on-call system was changing and I would now be expected to be on-call for the whole of the department. I don't even know how many schemes this includes but suspect it is around 100 or so. I have been told I will receive a verbal handover to prepare me and that a lot of the issues which arise are similar to the calls I get presently. I am told I will be on-call less often than before.

I am agrieved because all the other on-call managers receive an on-call allowance. I and the other 2 managers don't and have always been told we aren't paid a separate allowance as it is already included in our salaries. However this no longer seems fair because of the increase in responsibility. My gut feeling is that I should now ask for an on-call allowance. Could anyone advise me if I have any grounds for this?