Help with buying digital piano...?

I'm starting piano again. I played about 2 years ago, but gave up because my teacher went to uni and I could not find another one as good. I have now moved house and there is a very good teacher just down the road from me. I now need to purchase and keyboard / digital piano. I am unsure as to how many keys,... show more I'm starting piano again. I played about 2 years ago, but gave up because my teacher went to uni and I could not find another one as good. I have now moved house and there is a very good teacher just down the road from me. I now need to purchase and keyboard / digital piano. I am unsure as to how many keys, which brand, e.t.c. I need some advise as to where I can find one and what one to buy. Also, I have a low budget of £100 - £200. I am happy to buy second hand, obviously that will probably be the case with my budget. I like in the UK. Thank you for your time (:
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