When do I call in the sparky

[Fluffster]

Hi Guys
I am building my kitchen extension and would like some advice please as to what stage I need to call in a part p sparky.
I have theramalite block walls, roof with insulation between joists and the floor screeded.
My next job is is to insulate the walls with pir 5Omm boards.
Do I need my cables laid before or after the insulation is fixed?
I will have plaster board with finish coat on top.
Thanks
Pete

 

[Chivers7]

Call a few as soon as mate that way you'll get a quote and also whether the able to do the work on your timescale, and definitely before, hasn't your walls got a normal cavity with insulation on that. And how did you know my name was Pete