In Closer Magazine - 29 March - 4 April edition there is a voucher for a free Millie's Cookie & Hot Drink on page 92.
I don't know how much the cookie and drink is worth but the magazine costs £1.20.
The voucher is valid till 28th of April.
I've scanned it in and posted it below because it does not say that photocopies/print outs are not allowed
so hopefully they will accept it.