An MP has demanded Scotland’s top football clubs pledge to cut ties with the betting industry.Ronnie Cowan is writing to all 42 professional sides urging them to sign a charter being launched at Westminster on Wednesday.The agreement would see them end all sponsorship deals with gambling companies and refuse to display advertising in their grounds, in print or digitally.It comes after the Sunday Mail revealed SFA chiefs secretly banned players for breaking betting rules.Hamilton Accies boss Brian Rice received a 10-match ban, which was suspended for five games, after he breached regulations to feed his compulsive habit.Cowan, vice-chairman of the All Party Parliamentary Group on Gambling-Related Harm, said: “I welcome the launch of the