When installing many 240v ir lamps in a close proximity off one anther, would it be best to pick up mains localy?

Or install a ring main???

Probably best to get a sparky, which you would have to thanks to Part P if you were installing a new circuit. If you want to do it yourself you can only add the lamps to existing circuits.

So it would be best to spur off locally then? Gonna spec the job next tuesday, hopefully will be able to do so.

You could just take one spur from a local ring, terminating in a switched fused spur, and then loop all the IR's into that spur.

Or, you could install one spur for every IR onto a circuit local to each unit.

Or, you could run a complete new circuit back to the CU\DB, but this is inside the scope of Part P so you'd need a registered sparky to do the job.

Lurch

Part P only applies to domestic premises, otherwise it needs to be in accordance with the Electricity at Work Regulations 1989 and BS7671:2004.

Part P only applies to domestic premises,

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Ah, yes, there is that. Ignore the Part P bit then! You can do any of the three options yourself.