New to me that one, things change all the time, I have no faith in NICEIC or NAPIT or the rest, All that is required is "work must be carried out by a competent person" and that's it.
To register with one of them just means you can use their logo on your van and website, so not worth over £400 per year for that to me.
I'm sure some guys will disagree, but we all have are own opinions.
At the end of the day, you just need to be 100% sure you know what you are doing and it's going to be SAFE !
There is no substitute for experience so if you can get someone to work along side for 12 months, then you will gain more than any £400 logo
regards
Eliminator