No probs best to make sure everything is shipshape for Anna to come over. many have rushed in and then it causes problems for the two of you.
As important as savings is to show you have at least 50-60 quid spare a week so 200-240 quid at least spare a month other all outgoings.
Never said in any docs but i hasve read its the figure quoted in appeals.
Basically its the amount for i think its income support the least a person can get by on a week.
Of course you need this amount or more anyway to look after Anna.