I would with respect suggest that Andrew is correct in that is is doable. - You need to note that the 17th Edition Of the Electrical Regulations covers the wiring of homes and buildings with a view to protecting people, property and the actual electrical wiring. They do not cover the connection of items that plug into this wiring, whilst they can set the standard for electrical contractors and thereby have a common fit system they have no control over what is plugged in. Obviously manufacturers of appliances have their own individual standards which should be followed. As this is in effect a portable appliance the standard tests for double insulated appliances would surfice.
OK lets see if we can help you here - What are you intending to use the UV lights for as there may be a HSE requirement that also needs to be taking into consideration?