It depends on how proactive you want to be. You look like you've gone the distance with ADSL, so this might be of interest...
FTTC suffers from a problem that is less prevalent in the ADSL world: crosstalk from other FTTC subscribers can cause your SNR to decline over time (so leadding to lower sync speeds) and/or increase your error rate. If the latter happens, then DLM might intervene to turn on error correction & interleaving, also having an effect on sync speed and on latency.
The worst part is that there is almost nothing you can do about it. You can't get the ISP to reset it; you can't tweak SNRM's. You can just wait patiently. And you can monitor it, if you wish.
But it probably *is* worth you logging the line's behaviour in the first two days - during which DLM sits back and refuses to intervene. Those first 2 days can give you a good feel for the line status & quality - and you might want to refer back to it later.
For me, that monitoring means:
1) having an HG612 modem that has the open firmware on it, allowing you to manually log in & extract data. This, in turn, allows logging tools to do the same thing.
2) Running the HG612 monitoring scripts, courtesy of BaldEagle1, found here:
An alternative package is available there too.
Either packages takes samples every minute.
3) Uploading those statistics onto the web, via MyDSLWebStats.
See the same website
4) Separately, having a TBB BQM running
This helps you monitor the latency of the connection, so long as you have a static IP.
It especially lets you see the impact of DLM intervention.
5) Separately, running a few speedtests at speedtest.net
Keep a few going over the first 4 days, so DLM changes are noticeable
6) Separately, running a few speedtests at the BT Wholesale speedtester,
and each time asking for the "extra diagnostics"
This isn't so important for the speeds shown, but more so for getting a record of the "IP Profile" value that BT has recorded. This will be based on the sync speed (around 3% lower).
I'll be moving (and hoping to have the new line installed on the 9th), and I'll be taking care to do all of these things.