HMRC reporting funds in an RRIF

So we have an RRSP and we plan to convert it to an RRIF as soon as we are resident in the UK. But my understanding is that the UK sees an RRSP as "transparent" and not tax-deferred. Does this mean I must make sure any funds within the RRIF are HMRC reporting-funds if I want to be taxed at capital gains rates rather than income tax rates? Does anyone know what HMRC reporting funds are available in Canada? The RRSP is at RBC.