Problem: we were sending the first line of the address in the
`TO_NAME_2` field. This meant that they couldn’t do any PAF lookups with
it, because it wasn’t where they were expecting.
The first line of the address is the second line of what our users give
us. We need to give this to DVLA as the _third_ line of the address
output, which they call `TO_ADDRESS_LINE_1`.