It’s customary for the person doing the hosting to pour the tea out, and for the teapot to be left on the table with the spout facing the person who poured.
If sat at a table, the proper manner to drink tea is to raise the tea cup, leaving the saucer on the table, and to place the cup back on the saucer between sips. It’s considered rude to look anywhere but into the cup whilst sipping tea, and absolutely no slurping!
A few more absolute no-no’s are; unfortunately, is it inappropriate to dunk one’s biscuits in tea! (of course, this only applies when in polite company!), and also, no using tea to wash down your food!