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Yes, but you're at the whim of the electrician who signs it all off and some can do but won't, some can't due to restrictions by their registration body. What you're describing is third party authorisation and it's carefully regulated as it's clearly open to abuse. You are supposed to contract the electrician before work begins and have them accept the job, it ends up being such a palaver that most electricians would rather run the wire themselves.
Do Part P regs permit me to run a twin & earth cable from the consumer board through a void to the back of the house?
I'm not connecting anything, just putting the cable in place.
There's a buried armoured cable at the back of the house that this will eventually be connected to
The intention is to have a sparky make all of the connections - at the consumer unit, at the junction box, and in the shed.
And then sign off on it all, hopefully.