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all you want

SLT Broadband is designed to deliver the best performance possible on your line.The maximum possible speed of the service will depend on a number of factors. The main factor affecting your broadband speed is the distance from your telephone exchange to your home. Generally speaking, the closer you live to the telephone exchange; higher the broadband speed you can achieve.

Even though some of these factors are outside of your control, many others can be mitigated.
Factors that may affect the performance

Your actual achieved speed may vary substantially from theoretical values based on

So it's quite true that the various factors listed above will reduce your performance from theoretical values.

Following parameters may be useful in understanding the advertised bandwidth.