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If you look here
http://www.dslzoneuk.net/adslmax_explained.php
you will see that your profile will be set at 1 Mbps if you keep that downstream sync rate.

You may be better off with a fixed 2 Mbps link rather than Max ADSL.

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There's no ADSL Max involved here so none of this applies! This is an Opal Telecom ADSL2 LLU connection.

He may still be better off on a fixed 2 Mbps link.

RE-ADSL2 should achieve a considerably faster connection than an a 2Mb ADSL1 one once it's correctly set up, especially as it won't be capped by ADSL Max IP profiles which can really slow things down in this range of speeds. Unfortunately the OP is going to have to battle with TalkTalk CS to achieve this. Anyway I'm afraid it's academic as there's no way TalkTalk will put the OP back on the BT 2Mb as it costs them considerably more.

Do you think they could squeeze much more out of that line? There seem to be quite a few errors at the current SNR Margin.

137 uncorrected errors in 18 hrs is very low. Most people don't notice 20 times this rate. Also the OP is saying that the line used to operate reliably at 2Mbps (which would have been ADSL1), so this must have been with a considerably lower margin. Assuming of course that BT haven't made a hash of connecting the line to the new DSLAM.

I was looking at the errors versus the amount of data transferred.

I don't know at what rate errors increase with sync rate but I wouldn't have thought it would be linear.

I haven't seen any graphs of error rate versus sync rate - they would be interesting (unless it is linear in which case they would be boring).

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I was looking at the errors versus the amount of data transferred.

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That's not an appropriate reference. The error rate is completely independent of the data transferred. It's a count of errors occurring in the channel regardless of whether the channel is transferring data at the time.

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I don't know at what rate errors increase with sync rate but I wouldn't have thought it would be linear.

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At the risk of sounding like National Rail, it all depends on the sort of noise! In other words you can't tell until you try it. Again though, we know the line has operated on 2Mbps successfully on a less efficient version of ADSL, so it should comfortably be able to operate at 2Mbps on RE-ADSL2.

Well! I'm mesmerised by all this technical talk!!
My one brain cell seems to be telling me that I'm probably on an 8meg line now.
I was possibly better off on the old BT 2meg line.
Encountering the TT customer service experience will probably be futile and painfull!
Final Questions,
Will I notice the difference?
will it restrict my use of the net?
Lastly, Thankyou all for the professional scrutiny, and your time and trouble. It's appreciated.

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That's not an appropriate reference. The error rate is completely independent of the data transferred. It's a count of errors occurring in the channel regardless of whether the channel is transferring data at the time.

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Not sure that I understand that. The errors such as FEC and CRC are checksum errors on the data transferred.

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Well! I'm mesmerised by all this technical talk!!

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Apologies - point taken! Yes, you can definitely say that you've transferred to TalkTalk's 'up to 8Mb' service, and that the improved technology they use on this service should be able to achieve a better speed than the 2Mbps you had before. Unfortunately they currently appear to have configured the new service so that this is not the case. The 'noise margin' is the parameter in question. This is set by the ISP as a compromise between line reliability and speed. The higher the margin then the better reliability but the lower the speed. What I think from your stats is that they've set this far too high.

You can either ask them to lower it, or a possible alternative would be to ask them to set you on a fixed 2Mbps on the new service. The former gives you the possibility of exploiting the improved technology to go to even higher speeds. The latter is probably simpler to ask for.

Hope that makes more sense!