The most well known pedophile Garry Glitter was refused entry into Thailand. When he arrived from Vietnam he refused to take the connecting flight to London and got stuck in arrival since Thailand did not want to let him in either.
The government could not force him onto a plane so they put him in hotel over the night and the day after he want to Hong Kong. But in a Hong Kong also refused him to enter and sent him back to Thailand.
When Garry Glitter arrived in Thailand the airport is going to put him on a flight to London but they did not say how they would do it. When he arrived in London he will be met by Police that will question him and make him sign a pedophile act. He can then be refused to travel abroad, but right not that does not seem to be a problem since no countries wants him.