Am I entitled to close this regular savers account and withdraw the balance at no cost to me?
To summarise above posts - if you close, you lose the bonus interest earned since the last anniversary date. So you will incur a cost.
However this cost will be less significant in your case, because it's not long since your last anniversary.
As a guide - for an account with an average balance of 10K, closing now would lose you about €7.30 (after tax) for each week you had it open between the last anniversary and yesterday.
Alternative is to draw all money out down to the minimum of €10, and alter the DD to €10 a month, which (according to above posts) still qualifies you for the bonus interest.