There is a new and upgraded version of the checker running at www.coolwebhome.co.uk/calc/calculator.php.

ADSL and ADSL2+ Line Capability Estimator
Link to a useful fibre checker for Openreach FTTC/FTTP

Enter the data from your ADSL modem to receive an estimate of the lines capabilities
   Connection Data
(to estimate downstream speeds enter just downstream data, alternatively enter upstream data to estimate what your maximum upstream speed will be)
   Sync speed Kbps Line connection speed in Kilo bits per second as reported by the ADSL or ADSL2+ modem.
May be called data rate, connection speed or downstream rate.
   Attenuation dB Downstream or Upstream Attenuation
   Noise Margin dB SNR Margin, Signal to noise ratio margin

If you do not know how to obtain your line stats from your ADSL modem or router then visit Kitz's website which provides details of how to obtain this information for the most popular modems.

Your maximum line connection speed using an ADSL (up to 8Mbps) service is:

If using a BT Wholesale Max product, then your expected IP Profile (sometimes called BRAS Data Rate) will be.
The IP Profile is set based on the lowest speed seen in the last 5 days, it drops immediately, but may take 5 days to improve even if you reconnect at a good speed again.
If your service provider uses ADSL2+ the maximum line speed likely is:
With ADSL2+ the maximum IP throughput (result from a speedtest) is likely to be around:
If your ADSL or ADSL2+ connection speeds are slow for the attenuation of your telephone line then take a look at this guide to removing the ring wire from your extensions.

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