I have the same problem.
Do you have TIgniter installation localy?
I described my problem into other thread:Error: This restaurant currently does not deliver to your address .
open TIgniter, at the bottom choose Our locations, in search box input postcode (for LEWISHAM-E9 6QH) I got filtered only restaurant LEWISHAM.
Than I opened this location local/lewisham choose enter location (again enter E9 6QH) and nothing happened.
The same is for newly entered restaurant in my location.
Like, post checking doesnt return back ?
But on demo page I can see that it work!
Can anybody who solve this issue can help us...