Mains power point wiring, and associated cable cladding/tubing

[Sysman]

The other thing is that cable sold by Homebase had to be recalled coz it was made in China.

Make what you will of that.

faulty, non compliant cable

This has the hallmarks of a beancounter trying to recycle stock that should be written off.

[d000hg]

Can you not get your chosen electrician to consult/advise "how should I set things up for you?"

[RSoles]

Another vote for getting the electrician to do it.

However, if you do go for laying the conduit yourself, lay a string down inside it first.
- Much easier to pull a cable through than to push it.

[Archangel]

Lubricant helps too

Ideal Yellow 77 Wire & Cable Pulling Lubricant 950ml | Electrical Conduit | Screwfix.com