Google adwords - Wordpress issues - advertising to UK

I am trying to sort out a you tube ads campaign that I have set up. I have enabled it for several countries including UK but for some reason it never seems to get views in the UK (but does in say USA). Also tried to get it played to just, for instance, Dentists but again if you just specify Dentists it will not play at all to them. I think also conversion tracking in wordpress is not set up correctly. I am selling a financial training course and am wondering if there are special Google rules for such ads in just UK.

I need somebody who is familiar with wordpress and you tube marketing to have a look at these issues and advise me how I can resolve them