Well my address is...
The upgrade for STBs will be when everyone (in the area i gather) who is on the 1mb speed has had their pace box swapped for a samsung. I have had rumours that this will be October but nothing i am saying is official
Also, it is worth bearing in mind that the speeds will not be upgraded until the hardware in the area can deal with it.
The problems in the Poole/Bournemouth/Southamptons are fairly major network issues, due to the original network that was installed.
If you send me some account details (pid, serial number from stb smart card or account number etc) I will be able to have a closer look at your connection and see if there are any individual issues that will make the problem worse.