If you think getting tickets means advance planning to go and see where Harry Potter had his adventures (WB Studio Tour north of London near Watford) just wait until you try for dates after the 6th of April.
That is the day that the new expansion of the tour opens, including Gringotts and even Bellatrix Lastrange's vault at the goblin run Wizarding Bank.
There will also be a new lobby and cafe.
This is just a reminder to book your tickets just as soon as you have firm dates.