There's a rat in mi kitchen, what am I gonna do?

I came to work today to be greeted by an awful smell. One of the secretaries said that the estates department have been over and concluded it is not the drains and it is most likely a dead rat that has been nicely decomposing next to the hot water pipes over the last few days. The smell is truly horrendous and I think I am going to have to take work home this afternoon, I cannot be expected to sit at my desk inhaling in dead rat cells all afternoon.