What is the actual speed I will receive using a BT...

Hello.
I am thinking of changing Broadband company for quite a while now because my Internet speed is worse than usual and is never consistent. I was thinking of changing to o2 Broadband but I heard it uses a BT Landline so I decided to check the speed and availability on the BT website first(both through using my address). It said I could receive a maximum of 4.5Mb whereas the o2 website said I could receive up to 8Mb. Since o2 uses a BT landline I am quite confused about what speed I would actually receive.
Any help would be appreciated.

O2's "up to 8Mb" sounds like the marketing phrase all broadband suppliers use for the maximum possible speed of ADSL if you live inside the exchange. In reality the laws of physics apply and the further away you are from the exchange the more the cable between it and you eats the signal resulting in slower speeds. So most people never actually achieve that figure. If you rummage around your hub stats you will find a figure for your downstream Attenuation, this is an indication of how long your line is.
You can try this site to confirm if the figure BT is giving you is about right for your distance from the exchange. Note that you only have to plug in the attenuation figure, it will estimate the distance from that. Also note that this assumes a clean line with minimum noise. Since another Broadband supplier (except cable) will use the same physical telephone line to connect to the exchange this figure will apply to all.
There are then other things to take into account like congestion at the exchange which will vary depending on the supplier, but it's harder to get to the bottom of that.

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