However that really doesn't matter.
- In the normal course of events, apart from sale of a property, it is highly unlikely that DIY wiring done without Building Notice would be detected.
- Enforcement for building regulations violations can only be done up to a year after the work was done.
- When it comes to sale time, assuming that questions about wiring are asked, then it is a simple matter to get a regularisation certificate. An inspection can be carried out as part of that at the instigation of the vendor or the purchaser. A diligent purchaser would have an inspection done anyway. He might make a case for the vendor to pay of there are irregularities.
All in all, very little effect.