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Well it seems not, as demonstrated in this banner advert (hosted on the cliniccompare.co.uk website this summer) for Botox treatments at the nationwide clinic chain for Transform Cosmetic Surgery Group. As a company established in 1974 they should be very well aware of the UK regulations on the advertising of medicines, specifically prescription-only ones.
From August 2012, the relevant UK legislation covering the advertising of medicines to the public is Part 14 of the Human Medicines Regulations 2012. This codifies and has replaced the Medicines (Advertising) Regulations 1994 and the Medicines (Monitoring of Advertising) Regulations 1994.