It's nothing too taxing just a warning and some sales patter added in. The warning is that with 5 days to go in July you have already used up 80% of your 'free' internet usage. If you go over before the end of the moth you will be charged £5.50 for each 5GB you use, after October it will be £7.50 for each 5GB.
The sales bit is asking if you want to pay a bit more per month and have more internet usage. Just don't overdo your time on the internet for the rest of the month and nothing different will happen.