It has been 3 years since pharmacies needed to apply for a T28 Exemption and as the certificate only lasts for 3 years It may be prudent to check your exemption and make sure you re-apply if need be. We understand that the environmental agency only send out one reminder out so could easily get missed.
The PSNC have a very useful resource page which contains information to help make sure you are compliant with the Essential Service specification of Disposal of Unwanted Medicine as well as compliance with current legislation. There are also some useful FAQ's, resources and links to gov.uk and the environmental agencies for registration of your exemption.
This page can be accessed by clicking here and is worth a review to ensure you are fully compliant.