JumboJet1999 is correct it seems that people get the names muddled up. Strictly speaking (with pendant mode enable), the IMC is a rating which can only be added to a UK licence under the UK ANO and IR(R) is the name EASA gave the rating in Part-FCL and so when added to an EASA PPL (even one issued by the CAA under Part-FCL) the rating is called IR(R) and when added to a UK Lifetime Private Pilot Licence (the old pre-JAR poo brown licence) it is called an IMC rating.