The Lenovo A10 is an excellent buy. 10.1' screen, it says it comes with Android Jelly Bean but it will update to Kitkat once turned on. Lenovo have installed their own launch screen; if you don't like it, simply install Google Now launcher to make it like any other Android device. I bought mine a month ago for £130 and it's truly exceptional value for money. Screen is very good; if you look closely you can see pixels but it's more than adequate for day to day use, good weight and battery life is fantastic. For an excellent Android tablet that won't break the bank, I would wholeheartedly recommend the Lenovo A10. Available for £100 refurbished. Though with your £250 budget, you could well look at a Samsung equivalent; several friends have these and I've not heard a bad word said about any of them.