Hi, I notice you're York based, did you study at York College or the Uni?
Some things to consider:
Saying you want to buy a printing press is a bit like saying you want to buy some transport, it's open ended and very non descript so what level of print are you intending getting involved in? Letterpress, digital, sheet fed litho, continuous feed? Do you have any idea of the difference between them or the jobs they do?
Do you have any experience in the print word? Can you take a design from pdf through the plate making process to setting up a printing press then complete the finishing process?
Are you aware of the other equipment required and the expenses involved?
What about premises? Anything other than a hand operated Letterpress will need a lot of space (and electricity).
Why not contact some of the local printers like The Max in Dunnington or Colour Options in Elvington and ask if you could go and have a look round or do a work placement?