Be careful, some over the counter medications in Europe and other parts of the world are controlled or banned here. A popular muscle spasm medicine in North America contains some codeine which is not legal here.

Ignorance won't save you if it is discovered your UK OTC medicine contains something the MoH here has banned or requires a prescription. Do I think you'd be caught bringing in a bottle of XYZ? Probably not but I'm not familiar with what Qpost or the courier companies do to screen shipments.

I don't know if the MoH has list here but I know the UAE MoH has an extensive listing of controlled substances on their website.