Information subsequently received from the ECB Board has stated that the seemingly sensitive information about items of budgetary spend mentioned before were in fact purposefully made available to anyone who might want to take an interest. This (still does) surprise me but clearly no adjustment(s) needed!
A copy of the 2016 Annual Return can be downloaded above.
June 2017 A table summarising the ECB finances since 1997 is on the stats page. In the year to January 2017, the ECB lost £37mn, the reserves were halved, the explanation being much larger payouts to the counties.