Does it mean that soon after September, BT will be able to offer me 40MB Infinity?

sept30 is a holding date that may (will) change forward or back.
line rate likely to be a little less than 40, (checker says 25...)
other fttc companies are available too.
ps if you dont like 24mth contract, you can ask how much it would cost to end it early...

According to BT, we can get BT Infinity at 25Mbps now. We're a bit further along Plymouth Rd from you!

Dubious whether we will get that, the copper around here is a bit old and flaky. We should really get 12-15 on 02 ADSL2+ LLU considering our distance from the exchange, but only get 6. But if we get 15 or more, I'd be happy.