Any HR people ....Covering for Manager on mat leave for the 3rd time?

[ladybirdpoppy]

My manager is due to leave in August for mat leave for her 3rd baby, the past two occasions I have covered her work as she was only off for 4 months then 6 months which was manageable but not really enjoyable but got through it. This time she is planning to take the full year. When I went on mat leave for 8 months they got a temp in to assist. I just have enough hours in the week to cover my own work not to take someone else's full time job on...
I am having a meeting shortly to discuss this and they are going to ask if I can cover again, not sure if I want to this time, would it look bad if I don't want to do it, can they make me do it?
Any advice as at the moment I have a stubborn head on saying no...
Thanks

I think it depends on your contract as to if they can make you do it but you wouldn't be unreasonable to ask for an 'acting up allowance' and for a temp to come or another member of staff to cover some or all of your regular workload.

I asked for more money when asked to take extra responsibilities from someone going on mat leave and I got a temp uplift of about £2k which was nice .