Is this legal to use in the UK ??
If it is not registered for use in the UK then its use is illegal.
This brings us to one of my all time favourite slagging subjects: the uneven playing field of the EU. Each country is different and a product registered in one doesn't mean that its use is permitted in another. For example, generally the use of antibiotics on bees in the EU is prohibited, the UK managed to get an exception to this for Fumidil B for Nosema and terramycin for EFB. Fumidil has now had the exception withdrawn and will only be available whilst stocks last. So theoretically UK honey can contain antibiotic residues and could be sold in any other EU country legally whereas a honey produced in that country would not be allowed to have any residues.
So, honey produced in a country where amitraz is registered would be allowed to have residues of the chemical in its honey and sell that honey anywhere else in the EU without a problem. UK produced honey is not permitted to contain amitraz residues.
Amitraz is not registered for use in Greece or Cyprus. Homemade treatments of this as the active ingredient are widely used. The health departments have carried out extensive tests with a 10PPB level of detection. The results? ZERO residue! Why? because it is a very unstable chemical and breakdowns quickly in both honey and wax leaving no residue.
One of the reasons for non-registration in other countries is that the amitraz treatments are often useless, because of breakdown, by the time they are used.
Checkmite + is registered for use in Greece and Cyprus, but not in any other EU countries as far as I know. A MRL exists however for the active ingredient (coumaphos) due to the registration of another Bayer product Perizin. So, coumaphos residues throughout the EU are OK. Believe me, you do not want coumaphos in your hives.
Same goes for labeling: In the UK the use of the word "Pure' is permitted, but not in Greece and Cyprus and probably some other EU countries. So, a honey packer could import honey from say China, bottle and label it as "Pure Honey", export it to Cyprus and it sits on the shelf with a marketing advantage. This actually happens. Unfair? YES! legal? YES!
I urge all readers to not re-cycle wax from brood combs into foundation because of contamination issues. Only wax from cappings should be used for foundation and if possible use your own wax for your foundation.
Stay away from all hard chemical treatments and try to only use thymol and or oxalic acid only. They have their downside as well on the bees but at least do not polluted wax with potent toxins that are impossible to get rid of. It's all a trade off between the good, the bad and the ugly = benefits/negatives/Varroa.