Look on the NHS site and you will find:
Where can I get an emergency supply of medicine?
If you urgently need medication, contact your prescriber immediately to arrange a prescription. If this isn't possible, you may be able to get medicine from a pharmacist in an emergency, subject to certain conditions.
You must have been prescribed the medicine before by a doctor, dentist, nurse independent prescriber, optometrist independent prescriber or other healthcare professional, who is registered in the UK. In addition to this, the pharmacist:
will usually need to see you face-to-face
must agree that you need the medicine immediately
will usually need evidence that you have been prescribed that medicine before
must be satisfied with the dose that is most appropriate for you to take
The pharmacist may provide an emergency supply of up to 30 days' treatment for most prescription medicines, with these exceptions:
permitted controlled medicines (controlled drugs) – up to five days' treatment (Zopiclone is now a controlled drug)
...
The pharmacist will then make a note in their prescription book of:
your name and address
the nature of the emergency
the date of the emergency supply
the name, quantity, form (e.g. capsules, tablets or liquid) and strength of the medicine
Even if the pharmacist is unable to give you an emergency supply of a medicine, they will advise you on how to obtain any essential medical care you may need.
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I've been near enough the situation myself to have looked the information up, but in the end didn't need to use it. But presciptions for Zopiclone are a touchy subject, so don't be surprised if the pharmacist declines to help.
Were you only given enough for 10 days?