Does your current Mastersocket's faceplate look like any of these:
If it does then this is a pre-filtered master socket which means that you can just conect a rj11 cable from the DSL port of these types of master socket faceplates and connect the other rj11 connector to the HomeHub 5.
With these types of master socket (shown above), you don't need microfilters.
If your master socket is a BTNTE5 master socket which looks like this:
Then for the FTTC self install you can use a microfilter with the rj11 connector from one end of the modem cable connected to the dsl port of the microfilter and the other end to the dsl port of the HH5.
The same type of connection for the modem cable is used for both FTTC and ADSL (ie rj11), we have a "VDSL" mk2 pre-filtered faceplate for our adsl broadband (due to our line being very long) and the rj11 modem cable comes from the dsl port on the mk2 faceplate and connects to dsl port on the router.
As you have a BTNTE5 master socket and having a FTTC self-install then you will need to use a microfilter which will filter the VDSL2 and voice signals.
Then use a rj11 modem cable (supplied with the Homehub 5) to connect one end of the modem cable to the dsl port of the microfilter and the other rj11 connector to the dsl port of the HH5.