Keyboard with full length keys (Cambridge CB4)

I'd like to learn the piano. Having spoken to a friend more familiar with keyboards and synths than me, I am reliably told I should look for a keyboard (not a synth), it should have full length keys and sound roughly like a piano, in order to start to learn.
I am in CB4, don't have a car, but ideally you would be located in the northern half of Cambridge or thereabouts.
Thanks for looking.