These massive aliens still tower over us at thirty feet tall, with elongated limbs and large, bulbous heads. But their skin now has a texture similar to tweed, and they wear bowler hats and monocles on their eyes. Instead of wielding advanced alien weaponry, they carry oversized teacups and saucers, and their ships fly the Union Jack.
Their speech is punctuated with phrases like "cheerio" and "jolly good show," and their war cries sound like a chorus of bagpipes. They may even have a fondness for scones and clotted cream, and their massive teeth could be used to devour whole pots of tea in a single gulp.
Despite their British sensibilities, they are still a fearsome and powerful race of aliens, capable of destruction on a massive scale. Their advanced technology is imbued with a steampunk aesthetic, with gears and sprockets whirring away as they prepare to conquer new worlds.