I2C
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If you're concerned about Part P (Building Regulations), remember that it only applies to dwellings, not commercial / industrial applications.
If you're concerned about BS7671, if the system was installed to the regulations at the time of installation, it's deemed acceptable by the current regulations.
Therefore, you will be ok. However as previously mentioned by others, common-sense would say it's not a good idea. Suggest your changes to the client in a presumptive way, I'm sure they'll be ok given the circumstances.
If you're concerned about BS7671, if the system was installed to the regulations at the time of installation, it's deemed acceptable by the current regulations.
Therefore, you will be ok. However as previously mentioned by others, common-sense would say it's not a good idea. Suggest your changes to the client in a presumptive way, I'm sure they'll be ok given the circumstances.