Companies House Filing iXBLI accounts

I am a little confused. I was under the impression that iXBRLI accounts were to be filed at both Companies House and HMRC. However the webfiling service at Companies House is only for dormant company accounts, so how do I file accounts electronically with Companies House ? I have only just set up in practice and am finding my feet with the whole iXBRLI filing issue.

Many thanks