House with a new cable to the demarcation 14 years ago when it was built.
I joined the Bigpipe Trial in mid-Jan on the VDSL option. So I just grabbed a Draytek DV130.
Initially, syncing on the modem at 18Mbps/9Mbps
After a week or so, I installed a master filter on the jackpoint I was using (turned out both jackpoints in the house were wired to the demarcation directly - no daisy-chain like you'd have with the old 3-wire system). That gave no appreciable difference to sync speed.
Then a couple of weeks later I got dirty under the house and fitted the filter to the demarcation. I also moved the cable away from the mains supply to the meterbox and the sub-main return to the garage. Instant 25% (5Mbps) download speed increase. What gave the most benefit from that I could not say categorically.
Then yesterday I replaced the existing wires to the BT jackpoint with CAT5E. Another 2Mbps download.
I'm not sure how far away our local cabinet is. I suspect it's about 200m away as the crow flies, and according to the Chorus map we're in a >20Mbps ADSL2+ area. But of course this is VDSL. I'm sure they used to show cabinet locations as a layer on their map but I can't find them now.
While I'm hardly ecstatic at the 28Mbps (31 300kbps sync) I'm getting now, I'm satisfied.
If I can just get my Draytek to bridge with my Netcomm NB16WV VOIP router (should be easier after the recommended Snappernet firmware update I did...) and get the 2Talk VOIP going (I requested and received a public IP too, so I'm not behind Bigpipe's CG-NAT) I'll be happier but I'm pretty new to this fixed line broadband thing so it's a bit of a steep learning curve.