Your Audax UK Membership could be about to expire! As I write this, there is just over 2 hours before the end of 2017.
Also, now is the best time to alter your 'ACP club choice' if that sort of thing interests you, because later in the season that choice becomes locked and you can't change it. Find it in your 'My Details' page, near the top.
Basically, if you don't understand what this is, you can safely ignore it - but ACP attaches a single club to each rider they know about, in their records, and they don't expect this to change mid-season.
At this time (at the start of their season) you can choose between your designated club, or your designated
CTC CUK club, or AUK itself, to be the club that ACP associates. Not all clubs have an 'ACP number' and you'll need to make a choice that does result in a number. For example AUK has a number obviously, and so does yacf and so do most of the popular club choices. The first time you ride (finish) a BRM, this club gets passed on to ACP for their records, and the choice becomes locked for the rest of the year.
If you do nothing, the first time you ride (finish) a BRM, AUK's software makes an intelligent choice between these three options and passes the resultant club on to ACP for their records, and that choice becomes locked for the rest of the year.
Either way, until you ride a BRM, the choice remains unlocked.