Dennis Williams are not an authorised supplier in the UK.Dennis Williams sell cnd shellac and aslong as you are registered with them you can buy it so that can be someone who has only a hairdressing qualification or just spray tan certificate ect, there are lots of cnd shellac on eBay a swell as other professional brands. I personally use cnd shellac but I think if someone wants to use bluesky, gets good results and clients are happy then good on them and their profit margins
And as said before products being sold as Shellac on eBay are not being sold by the distributer but individuals and you have no way of knowing whether you are spending your hard earned cash on old stock, re-bottled polish, a fake or any other rubbish.