I would make room for a High Tea at Harrods…a true English experience!!
To avoid a possible mis-interpretation, the actual experience one wants at Harrods (or Fortnum and Mason, or several other posh establishments) is an “Afternoon Tea”. This is the experience with tea served with trays of dainty little sandwiches, sweets, and the like (also known as “low tea”, actually). If you just want tea and a lighter snack in a formal setting, ask for a “cream tea” (usually tea, cream, and scones). “High tea” is actually intended as a meal with meat served with tea.
One could do an entire exposition about the various, and overlapping terms of tea.