Dates of 6 items of correspondence

[wxyuanilr]

To extend my wife and child's family visa (5-year route), we need to provide at least 6 items of correspondence, addressed to me and my partner. The dates of the items of correspondence should be spread evenly over the whole 2 years.

We have 3 council tax bills in joint names issued in Jul 2014 (when they first entered the UK), Apr 2015 (yearly bill) and Apr 2016 (yearly bill), 1 water bill in joint names issued in Nov 2016 (latest), a few other letters addressed to me or my wife in October 2014, February, June and July 2015, etc.

These items of correspondence do cover the period since my wife and child entered the UK in July 2014 until today, but are not strictly spread evenly over the whole 2 years. Do you think it'll be okay? I don't really have or retain items of correspondence dated exactly every 4 months, and I believe many other applicants don't either?

Please advise. Thanks.