Is it true there will be really long queues at the post office?

Unfortunately, yes, the queues at the post office will probably be longer than usual, as people will be panic renewing their passports in case they are not allowed to go on holiday in Spain any more, and will be forced to spend the summer at Bognor Regis. Don’t worry though, the best way to get to the front of the queue is to either say you have a medical ailment or, if that doesn’t work, simply use force, i.e, swing a large object at those in front of you.