Correct date for the disposal, storage & use of existing stocks of pesticides. I have been using the HSE (Plant protection products with authorisation for use in the UK) also an excel download (PP products expiry dates as recorded in CRDs internal data base on the 18/08/2017) also word document downloads (Withdrawal / amendments of plant protection products in the UK) The above all give me different expiry dates. Which date should I use ?. If the pesticide I’m looking for doesn’t appear in the HSE data base, can it still be used in the UK. Is there a separate data base for withdrawn products ?. Please advise

Under the Biocidal Products Regulation ECHA have been maintaining and co-ordinating lists on behalf of the member states.

https://echa.europa.eu/information-on-chemicals/biocidal-active-substances

The list of active substances and suppliers to the EU market was last updated 9th October:

https://echa.europa.eu/information-on-chemicals/active-substance-suppliers

PT is the Product Type - key can be found here:

https://echa.europa.eu/regulations/biocidal-products-regulation/product-types

Baz

Is the question you ask perhaps about pesticides that have had their authorisation withdrawn on a phased (rather than immediate) basis?

If so, perhaps the starting point is 

https://www.hse.gov.uk/pesticides/pesticides-registration/withdrawal-and-restrictions/amendment-expiry-suspension-and-revocation-of-approvals.htm