Does not affect your no claims but can often affect your premiums, for up to five years, the BBC did a program about this a while back. I advise people who want a repair not to go to company that replaces. Even if you do not tell your new insurers they will have it on CUE so will know when they asked you if you are supplying the correct information.
If when your windscreen was repaired there was anything other than what looks like a dried raindrop left, then the job was not carried out correctly. The major companies lack the skills and tooling required to carry out quality repairs every time.
I can talk about this subject for hours, I have been involved in WSR for over 25 years, and have been teaching it and supplying tools to independent companies for the last 10.
www.deltakits.co.uk is one of mine.
Now think about this one a replacement company gets say £200 margin on fitting a new screen takes 40 minutes, a quality repair takes the same amount of time and gets them £45, I wonder which they really want to do.