Smiless,
Maintenance from where myself and glhcarl differ greatly due to that I am in the UK and glhcarl in the US.
If your report is on UK legislation then the requirements of the regulation are within the EU regs I posted.
An EU regulation is European Union Law. Further to this the UK Air Navigation Order, that does still cover many aviation criteria is a Civil Act of Parliament; this could land you a prison sentence if not complied too.
The ANO refers to the uk maintenance requirement as my previous post (EU reg 2042/2003). This is then covered by European union law.
Hope this helps
Beeline