Just to emphasise Martin’s comments:
The MHRA are now catching up with the FDA and times are getting harder for organisations that have never been exposed to this type of scrutiny before.
There are issues now surrounding the use of spreadsheet and how they are used, environmental monitoring system and have they been validated. If you use a computerised system/package in the GxP environment then the MHRA will be looking for a risk based validation prior to initial use.
GAMP 4 or 5 are guidance documents on how to do this but they are not the law (just now), they are there to help you with the process and you can develop your own method of validating your systems.. but ensure that your validation process that has been developed confirms that the computer system has been implemented correctly and that it conforms to the functional specifications derived from the original requirements.