Although a regularly tuned acoustic piano is ideal, a good electric piano is fine as an alternative.

It is important that an electric piano has 88 touch sensitive and weighted keys as well as a sustain pedal.  Dawsons and also Hickies, both in Reading have a good range of electric pianos and acoustic pianos.  I would suggest a Yamaha P-45 as a minimum standard.  This bundle  gives you all you will need (currently £375 from Dawsons, though obviously available elsewhere).  It is sometimes possible to pick up a decent second hand electric piano on ebay.

For tuning an acoustic piano I would recommend Ben Wheelers 

They also have a selection of new and second hand pianos for sale.