I’m afraid there aren’t a lot of regular discount codes knocking about now Unlimited is phasing out (though the Unlimited 25% off £40+ still works if you were an existing Unlimited member before the shopping site update).
If you listen to the podcast there’s a 15% off code? Or there’s the 20% off one if you sign up for texts?
These don’t work with these Exclusions though.
Or there’s the Service Discounts if you happen to have a job that fits?