If it were a manufacturing defect, as opposed to delivery damage, then yes, you're covered after the 30 days. You lose your immediate right to reject after that time, so the retailer would only have the choice of repair, replacement or refund in the first instance.
The consumer rights act 2015 covers this scenario (goods must be fit for purpose, of satisfactory quality, and as described).
If the items however had delivery damage, this might be a condition of the retailers terms and conditions that you check for this. At the very least check the packaging for any dents, dints or holes, and explore further.