Thanks Paul, yep I'm aware that you can still do this in the way you have described. I was just stating that they have made it harder for web applications such as followthatsite to screen scrape that data without the necessary steps to be taken first.
Agreed, TBH I have never used followthatsite, but my guesses are that it either injects the required information in the URL Bar as a GET Query, or it allows the user to supply the required information and it does a POST request.
If so I cannot see that working any more since their changes which you probably already know.
Example of how it has to work:
[Phone Number Check]
1: Request main BTW page.
2: Entering phone number and send request.
3: If valid number extract information from response data.
Done
[Address Check]
1: Request main BTW page.
2: Request address checker option.
3: Request Proceed.
4: Entering Post Code.
5: Select required address from the response data.
6: Request with extracted information.
7: Extract response data.
Done
You also have to use Cookies along with the Referer along with other info for both ways or else it will fail.
TBH, I haven't tried the BTW checker for a while now due to receiving an email telling me to stop, which I did, I was back then doing several thousands of checks for people back then.
So they might of changed stuff, I know they now have a new valid Cert which is good.
Paul