Admissibility of computer evidence

[inquisitor]

Would anyone know if documents copied onto a computer, printing machine, etc are admissable as evidence in a Crown Court without the original documentation?

I'm only surmising that they wouldn't be, because of the obvious implication of doctoring, etc. ie, a mortgage application form could be tampered with simply by transfering a tick from one box to another, ie, in a case where the applicant had ticked that he/she hadn't already got a mortgage.

The same could apply to councils prosecuting in the case of benefit fraud vis a vis undisclosed savings, etc. where they were using computer records in place of  original application forms that had been dispensed with under the data protection act, or at the time were deemed superflous to requirements.

I thank you for any assistance that you may be able to afford me in this matter.