2012 Ford Territory windscreen condensation

Are you in the car when the condensation forms? If so that's probably the reason, it's a result of the humidity inside the car and it's quite common. Running the air-conditioner will dry the air and remove the condensation quite quickly. As for the rattling tailgate, persist with the dealer in getting it fixed, it’s really a matter of tricking down the source of the rattle and directly addressing that. The dealer clearly hasn't yet found the cause.