OP
Thank you ...this really helpful . I will put up a picture when I visit the property . Also The light fitting is encased but I will take a few measurements . It passed the last EICR so not sure wat has changedI'd nicely ask him exactly which regulation the current arrangements under the sink are violating. If you like, stick a picture up here of under the sink, then you can legitimately say you have sought a 2nd opinion.
If there's currently a leak or broken seal anywhere causing them to get regularly wet, then maybe external influences could be reasonably cited, otherwise I suspect this is one that 'looks wrong' to some people's eyes but isn't actually wrong.
Stick a photo up if unsure.
A google for "bathroom zones" should help explain this.
Zones 0 and 1 needs spray proof lights (IP55/65). Any gaps in the fitting or around the bulb usually indicate they are not spray proof. You are looking for a design that looks enclosed.
Zone 2 needs splash proof lights (IP44 or higher). I find this harder to determine, many people just use the spray proof lights here too.
If it's a taller than 2.25m ceiling, or the fitting is outside zone 2 then there are no restrictions.