I would like to think m&s would look into the voting that has taken place. This is part of the terms and conditions
If M&S identifies or suspects fraudulent voting activity has taken place, including, but not limited to, false email addresses, false social media accounts, duplicate email addresses or the use of disposable email accounts, the fraudulent votes will be removed from the project total, at the discretion of M&S, and may result in disqualification from the Competition
M&S reserves the right to check the validity of any entry and the identity of any applicant or winner and to refuse entry or refuse giving the prize if M&S reasonably considers the entry and/or winner to be in breach of the terms and conditions.