At their request, here are a few children's websites that are safe, vaguely educational but mostly fun:
RNLI's Shore Thing website packed with games
UK Parliament website - Take a tour of the buildings. Become a Member of Parliament for a week. Or swing from a rope to clean Big Ben. Games cover a range of ages and topics.
The Scottish Parliament website (Pàrlamaid na h-Alba) has a non too exciting games zone which features SP-ingo, (SP-ingo) a wordsearch (Lord-fhacail) and matching pairs.
Tate Gallery - as you might imagine, is rather cool. You can be an Art Detective, go on a treasure hunt in the Sculpture Garden, create your own imaginary worlds and lots more besides.
Edinburgh Zoo has a couple of nice spot the difference puzzles as well as a fun Sliding Penguin game.
Dogs' Trust site Learn with Dogs has a variety of interactive games for one and two players.
The Pod is aimed at teachers and contains games, videos, images and other resources, all designed to make schools greener. The games in the Gamezone are all on an environmental theme.
Direct Gov Kid's site takes a while to load but is well thought out and worth a look.
Sadly the The Department of Transport's 'Hedgehogs' campaign has gone into hibernation but there are several road safety resources at the Think! Education site.
But my favourite is Scottish Water's RoboPoop