I’m not sure what you are asking here. I know Europe uses a different system when it comes to certifications. Personally I don’t know if IDEA recognizes them just like they do with US based certifications. IDEA doesn’t serve as an organization that provides certifications. As for how popular IDEA is in the UK maybe IDEA can answer this question and I don’t know how many trainers from UK are members here. I know quite few Greek trainers that are members and they are enjoying their membership. I assume you are asking about membership fees as well. IDEA would be the best source to answer this one. I believe a CC should be all you need. I wish I had a better answer for you and I hope someone here will be able to help you more.