I need to buy a baby car-seat for when we visit family from abroad - it will live at grandparents house and will mainly be used to pick us up/drop us off at the airport.
I have found a v cheap one on Kiddicare for under £30. Don't want to spend much, as it won't be used much (we only visit about twice a year, and we have another forward facing seat waiting in the wings once the baby one is outgrown next summer).
I was wondering whether:
(a) A seat that is so cheap could possibly be any good - does anyone have one? I don't want to buy something that isn't really safe 
(b) if anyone could recommend any other similarly priced seats?
(c)whether second hand more expensive seat would be better - and if so if there is any reputable dealer or way of buying second hand so that you are more assured that it is safe and never been in an accident etc.
Thanks!