Welcome to the UK
It takes a miracle of biblical proportions to make the core drill guy responsible for the install drill at an angle so it self-drains.
In my own home office: "See these are the install instructions - you have to drill at 5 degree angle to ensure that water drains correctly out of the condenser". 2h later, the retard proud, gleaming and explaining with extreme pleasure about how he used the spirit level on his drill to drill it exactly level.
I just sighed, paid him up and used a smaller pipe and some filler so it goes at an angle.