It never truly gets dark in the UK in June: the solstice on the 20th leads to the longest day of the year. (Incidentally: contrary to what I've heard on TV, the radio and in classrooms, the seasons are produced by the tilt of the Earth's axis - in Summer, the north pole is tilted towards the Sun, in the Winter, it's tipped away) Despite this, several planets are still visible:
Jupiter will rise before the Sun at around 03.30 in the constellation of Taurus
Mars rises a little earlier at around 02.30. On June 3rd the thin crescent Moon will be close by
Saturn is visible for longer, rising at 01.00, with the last quarter Moon coming close on the 27th & 28th
The winter constellations have disappeared until the Autumn, being replaced by the familiar constellations of Cygnus (the 'Northern Cross') Lyra and Aquila, whose brightest stars Deneb, Vega and Altair make up the famous Summer Triangle.
An amazing and beautiful spectacle that may occur in June is a display of Noctilucent Clouds. An hour or so after sunset the northern sky can be covered by a tracery of electric blue threads and waves. The origin of this phenomenon is not fully understood, but is possibly caused by the long-set Sun illuminating extremely high clouds of ice crystals.