All depends how much all those things are... If you have a 2.5k mortgage and expensive childcare then that 5k isnt going to go that far.What do you mean by reassuring? 5k net a month should certainly give you comfort even after all those things?
If you have a 1k mortgage and low child care costs (say if you have kind grandparents or whatever) then it will.
I expect the average person earning 5k/month isnt going to be living in a £700/month house