Note the voltage and microfarads (uF), and pop to SS Radio on Mill Lane.
On the replacement capacitor the voltage will have
to match exactly. Ideally the uF value will match the original too; but as long as it is not less, the replacement can be over.
If they ask what type of capacitor you need, here is a quick visual discription: http://robotmill.com/2011/11/05/how-to-read-capacitor-value-codes/
If SS Radio, don't have one that works, try Maplin in Liverpool city centre or Cheshire Oaks.