I would be more persuaded that coumaphos is not used in UK if we could see some data on residues. It would be a bit surprising not to find it, as it is found just about everywhere else. There are a quarter of a million hives in the UK, and I doubt that all of those are pristine. 

> Residues are a major problem for coumaphos, at least in the solution form. A number of studies have found residues in wax and in samples of commercial honey. Coumaphos is the most commonly found miticide in honey in Germany. Coumaphos was found in newly produced wax 6 months after hives were treated with Perizin.

> Official maximum residue levels for coumaphos in honey range from 0.01ppm in Switzerland to 0.05ppm in Holland and the Netherlands. The EU does not have an MRL for coumaphos in honey. MRL’s have recently been established in the US for coumaphos (0.1ppm for honey, 100ppm in beeswax).

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