Can I send nail varnish, polish or gel (solvent and water-based) via Royal Mail ?

International  - Not allowed in the mail
UK - Allowed in the mail, see restrictions below

• Volume per item must not exceed 30ml.
• No more than four items in any one parcel.
• Bottles of nail varnish must be placed in strong outer packaging and be so packed, secured or cushioned in such a way that they cannot break, be punctured or leak their contents into the outer packaging.