Whether it's high tea or afternoon tea (originally afternoon tea was taken around 4pm b.t.w.) the point stands - tea is a short form for afternoon/high tea so perfectly reasonable to take it around 4:30pm or 5pm.
Elevenses and brunch - there's a can of worms being opened right there.
It has been suggested many times, but has it been confirmed this is the problem? If so, surely Scottish Water and/or the cooncil should be on the hook as well.