If you use the code 'yummyfood' (works for existing customers) you can get a £40 Ocado voucher + 3 month free delivery pass for £24.65. Please note the voucher can only be used for new Ocado customers.
There are also options for £60 voucher (incl. 6 month delivery pass) and £80 voucher (incl. 12 month delivery pass).