Normally a wednesday - but not always - 11 out of 12 draws in 2018
Normally every two weeks - but not always - 8 out of 12 draws in 2018
Sometimes a 3 week gap - 2 out of 12 draws in 2018
Close to (within two days) a two week gap - 2 out of 12 draws in 2018
So based on 2018 draws approximately 83% chance of on or within two days of to Wednesday 27th June. But I could be wrong!