https - How do I install a user certificate?

I have my own Root certificate that signs user certificates.

I have a site that will only allow you on with a user certificate which is signed by the root ca.

I have managed to get this site working in Ios and Windows, but just can't get it working from Android (4.2.2)

I have tried many different methods of importing the certificate including converting between formats - I get as far as it being recognised and "installing", but, it never actually seems to get installed or be visible anywhere (checked under trusted credentials > user).

I have read here and the only solutions seem to involve downloading/modifying files and reuploading then restarting - or to have modified firmware/similar.... I really want a supported way of doing this and don't really want to consider a hack as I need a scalable solution.