As far as I know there are JAA aproved IR courses in UK (all are mentioned above), Denmark (mentioned above) and there are two schools in Sweden. I have attended a IR course in Sweden on a 206L1 and was very satisfied, I had it put on a UK JAR license.
Good to know is that if you are British then Bristow might be a really good course. I know many people who went there and were very happy. But.... I also know that there are several JAA countries that will not regognise there IR training certificate (it does not come on your license untill you do a multi in UK). Know this from personal experience. But again, if you want to stay in UK, or are Bristish it is a really good course.
Besides I can really recommen the Swedish course (Bear flight) and I have heard positive things about the Danish IR course (mentioned above). Both these IR will come on your license and as far as I know, no JAA member state will have any problems with those courses.
Hope this helps you a little bit.