Recommend a keyboard for a beginner?

Hey,

I already play a few instruments, but due to paper thin walls in my flatshare, I can't really play when anyone else is in. I really miss playing music and always wanted to learn the piano so...I want to get a reasonably priced keyboard that I can mess around on and teach myself to play and write a few songs etc, since I can put some headphones in and not disturb anyone.

But, not knowing any keyboard owners, I haven't the first clue where to start. I want something basic enough, it doesn't need too many bells and whistles, but not with so few keys that I can't progress on it and something that I will be happy with for a year or two to come.

Any recommendations? I'll be buying it either online or in London and looking to spend no more than £100 if that is possible.

Thanks.