There is no longer an appointment system in Tortosa. We went a few weeks ago and were told to come back another day. The reason being they now only process a maximum of 20 applications per day and they had gone by 9:05 (the office opens at 9am). You have to take pot luck. We  stayed overnight less than 300 yards from the office and could see people queing from around 6:30 am!

We gave up.

John.