The three main credit reference agencies (CRA)– Experian, Equifax and TransUnion – have different scales to measure credit scores. For example; 700 may be considered "poor" on one CRA but "excellent" with another.
You can get a free, independent score from each credit reference agency which tells you the band you’re in.
There’s no universal minimum credit score needed to get things like a loan or mortgage as different providers have different lending criteria. But your credit rating must be considered good enough by your provider.