A few quick pointers that you no doubt already know:
A CV should be short and easy to read, as said above you probably have 30 seconds of them assessing the CV to make an initial decision so you must catch them then.
An initial statement can sometimes be useful:
An experienced electrician with competence in design and construction of industrial and domestic installations.
Qualified to NVQ3, JIB gold card holder, backed by ten years of practical on site work.
Very capable in installation inspection, testing and fault finding
Good team worker, with independent capability
That is a bit rough and quick but gets the main points across quickly.
Make it clear what you do and how you are able to do this; qualifications, experience etc.
Then go on to the detail of jobs, and qualifications but only include those items relevant to the job, having a cse in politics is immaterial, wastes space and the employers time.
But also if you are going for a job in a factory downplay the nine years of domestic installation and emphasis the one year of factory inspections and the like.
Try and make it easy to change to suit the job for which you are applying.
Always be positive not "I have little 3 phase experience", but "I am keen to build on my initial 3 phase work".
Check your speeling!
Good luck.