While I'm completely confident that nothing will appear on your CRB check, I'd like to correct some of the statements above:
For working in a school, a CRB check will be at 'enhanced' level. That means that (as well as criminal convictions) it can show any information deemed relevant by a senior police officer (or other relevant authority). For example, totally unsubstantiated allegations can appear. (A teacher posted, here on AB, when he found that an allegation of 'grooming' a child appeared on his CRB check, even though he'd never been questioned about it or even made aware of it). Similarly, information relating to a known associate of the person being checked can appear. (I know a teacher who found that her former partner's conviction for downloading child porn was mentioned).
Chris