Looks like I missed this one first time around.....

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Bjarney, it takes 8 bits to make one
byte
But remember that when we're dealing with asynchronous data transmission you need to add a start bit and a stop bit, so the maximum theoretical throughput in bytes/sec is not bits/sec divided by 8 but actually bits/sec divided by 10.

ADSL has actually just been enabled in my local exchange a couple of weeks ago and I have just received my first request to install the appropriate wiring at a nearby house.

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But I have to buy an external Modem plus filters for my 2 telephones
I wouldn't bother to go the separate filter route if you can avoid it. Better to install a filter/splitter at the network interface and then run the voice and ADSL on separate pairs around the house.