Readers of The Evening Standard have been offered a voucher entitling the bearer to one free children’s ticket to London Zoo, when accompanied by a full-paying adult.

The voucher was printed in mid-July as part of the paper’s “kids go free” set of deals and is valid until 31 August, apart from on Bank Holidays. The offer is restricted to one per party and can’t be used on group rates, advance tickets or coach rates.