The source adds additional information: "There are three types of cheque fraud: counterfeit, forged and fraudulently altered cheques. Counterfeit cheques are printed on non-bank paper to look exactly like genuine cheque. Forged cheques are genuine cheques that have been stolen from an innocent customer and used with a forged signature. A fraudulently altered cheque is a genuine cheque that has been made out by the genuine customer but a fraudster has altered it before payment i.e. by changing the name of beneficiary or the amount."
Data for earlier months are published also by UK Cards Association here.