If the power is on during the durationn then yes I believe. However, if at some point the electricity has been disconnected for safety, the site wont be relivened/reconnected until the certificate of compliance has been completed. Only a certified electrical inspector can issue this certificate.
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Thankfully the electrical regs are not retrospective like obnoxious laws like pool fencing.
In saying that it is something that does affect the value of a house, because if you get an old place with a 30 amp supply for everything, its basically unlivable for more than 2 people since 2 heaters and everything else will be well over what you can draw without blowing the breaker, and the rewire costs for some old places can be massive if they have a flat cieling with no access to it easily.