Getting half of sync speed

[#1]

I've been having some problems with my 80/20 service recently, I have replaced the ethernet cable between the modem and my router and even tried Plusnets router (yuk!).
An engineer came today and replaced some cables in the cabinet, the SNR margin has improved remarkably, was 15 down and 9 up, it's now 4 down and 4 up.
When I run a speed test over an ethernet connected computer I'm only getting 40Mbps, I have had a problem in the past when I was accidentally put onto the 40Mbps service, has this happened again?

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 16039 Kbps, Downstream rate = 72252 Kbps
Bearer: 0, Upstream rate = 19150 Kbps, Downstream rate = 67681 Kbps
Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        4.3             3.8
Attn(dB):        18.6            0.0
Pwr(dBm):        13.5            7.4

[#2]

have you checked your current line speed - see my sig for a link

[#3]

Didn't realise we could still get to that page!
Current line speed:
42.4 Mb
No disconnections since I posted the stats above last night.
dick:quote

[#4]

Only via a remembered link
You need to ask for it to be corrected - I suggest trying chat as you can be doing something else on the computer while waiting for it

[#5]

Seems to be fixed now, just waiting for G.INP to activate. If nothing happens I will reboot the modem in a day or so, interleaving is still extremely high but will hopefully drop.