Not sure if this has been posted as I haven't been here for a while, but.....
75% of ntl areas should see the upgrade BY 2nd August. 
The other 25% of areas will be done by 2nd Nov gradually as these areas require Cabinate upgrades.This is official info I have received this morning ( I work here) Some may get the increase before the 2nd but by the 2nd 75% of customers should have seen the results.
So in short... in 4 days time the majority of customers will have the increase. When the Increase happends, the SACM or STB will reboot and hey presto....
Thought i'd pass the info on for those who doubt it!