As BillySugger says, your broadband speed can vary depending on the time of day, day of the week etc. This is due to the load in the Virgin network or the load on the internet (or both).
Best thing to do is run it a few different times each day over a week or so and write down the details.
If you are on 2Mb (2,000kb) then 1960kbs is fine, 829kbs low.
The upload speed (the speed you upload things to the interent) is always much lower than your download speed and I would not worry too much about that (but still measure it and keep a note of it).