The upload speed is the speed at which you can upload files, say if you had a web site, or the speed at which you can send emails. The up to 448 is pretty much standard for Home Max broadband connections as opposed to 256Kbps upload from a fixed 1 or 2 Meg connection.
Download up to 8Mbps is therefore the speed at which you download files, browse the web. You say you want a 6 Meg connection, if you are already on ADSL Max you'd likely get the same connection speed.
Inclusive bandwidth is your usage allowance included in the package i.e. the amount of data you are allowed to download when browsing or downloading files or music. This allowance does not take into account uploads with IDNet (see above) so you can send as many emails as you like ;)
Whether you would need 2 or 30 Gig included is down to what you use your connection for. If you download loads of music then the 2 Gig allowance probably isn't the best for you. I do a lot of browsing and some, but not a great deal of downloading, so I find the 2 Gig allowance plus the option of buying more bandwidth at a cost of £1 per Gig over my allowance is fine for me.
One other thing, support is very good, someone from the UK usually answers the phone within a few rings and on a regional number not 0870 or such like.
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