My experience is they are fine search engine, seo, making income type things (which should be more important) but with a few exceptions .org.uk sales to an end user are a waste of time…. Not sure if its because people associate them with charity, non profit organisations or people have never heard of them…, e.g. you could have aproduct.org.uk and say buyaproduct.co.uk etc or any other combination of product and name and the end user will nearly always go for the .co.uk my advice would be either develop them or don’t bother regging them …?