Are you able to find your router stats?
See here for help. If you can't, at least tell us what the connection speeds are now, those should be in the router GUI. Perhaps even the attenuation is there as well.
It would be odd for TT to be installing LLU kit with a top speed of 8Mbps, though I believe they do still have some in their early exchanges. Assuming they are putting 24Mbps in, then your router stats now will tell us more accurately than any estimate what you should get. Where has the estimate come from, your ISP? Which is it, and is it they who are going to limit you, not the equipment?
It may also be useful if you post the link to what
samknows says about your exchange.
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