You are nice and close so you should get good speeds, you should have looked for the magic letters LLU not ADSL (which may mean O2 Access), the LLU packages are Standard, Premium and Pro.
The maximum speed is dependent on a line check after you are connected, so if you go for the top package (Pro), and your line can't sustain that speed, they will move you to a lower package.
Make sure LLU (ADSL2+) is there.
You also will have 30 days to change your mind if it's not right for you.
To support Disasters Emergency Committee: http://www.dec.org.uk/appeals text Nepal to 70000 to send £5
Sky Unlimited Broadband - Windows 10 - Nexus 4 Android 5.1.1