Still waiting for the cat5 cable to turn up from clarity but am getting very good speed and much improved from my very first stats of just over 10Mbs.
For those who're interested (and even for those that aren't) these are the stats from my extension upstairs hardwired to the BT master NTE5 faceplate downstairs to an ADSLnation master with XTE2005 faceplate upstairs with phone cable. The PC's are connected to the router via ethernet.

I've done a few proper d/l speed tests using large file transfers and regularly get over 1.2 MB/s and did see over 2 MB/s once but not for very long. Quite a few max users are getting very close to the advertised speeds but unfortunately quite a few aren't.

Not too sure if the errors are acceptable or not, there are 2 PC's wired to the router.

/usr/sbin/adslctl: ADSL driver and PHY status
Status: Showtime Channel: FAST, Upstream rate = 764 Kbps, Downstream rate = 13664 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.8 13.0
Attn(dB): 32.0 18.7
Pwr(dBm): 1.3 12.4
Max(Kbps): 13668 864
Rate (Kbps): 13664 764
G.dmt framing
K: 239(0) 24
R: 16 16
S: 1 8
D: 64 8
ADSL2 framing
MSGc: 109 68
B: 238 23
M: 1 8
T: 1 1
R: 16 16
S: 0.5573 7.7037
L: 3660 216
D: 64 8
Counters
SF: 5921070 5921068
SFErr: 139 5
RS: 680923162 50329078
RSCorr: 391258911 24
RSUnCorr: 1262 0

HEC: 115 4
OCD: 0 0
LCD: 0 0
Total Cells: 3057731745 171005118
Data Cells: 30716225 14011955
Drop Cells: 0
Bit Errors: 0 0

ES: 150517 4
SES: 28232 0
UAS: 985 16
Total time = 1 days 4 hours 55 min 54 sec
SF = 22545370
CRC = 1708998
LOS = 2646
LOF = 0
ES = 150517
Latest 1 day time = 4 hours 55 min 54 sec
SF = 1107947
CRC = 39
LOS = 3
LOF = 0
ES = 37
Latest 15 minutes time = 10 min 54 sec
SF = 40866
CRC = 2
LOS = 0
LOF = 0
ES = 2
Previous 15 minutes time = 15 min 0 sec
SF = 56152
CRC = 18
LOS = 0
LOF = 0
ES = 15
Previous 1 day time = 24 hours 0 sec
SF = 5337331
CRC = 723
LOS = 95
LOF = 0
ES = 265
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 56153
CRC = 1
LOS = 0
LOF = 0
ES = 1
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 56152
CRC = 11
LOS = 0
LOF = 0
ES = 11
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 56152
CRC = 5
LOS = 0
LOF = 0
ES = 4