Converting BT 5C Master to BT 5C with dual BT/VDSL filter

My mother is currently utilising Three 4G as her internet connection (long story) and I am looking to switch her over to a FTTC connection.

Her BT Master Socket is a 5C (but only with a phone jack front plate) and I am looking to change her over to a combined phone/RJ11 filter.

Searching around this seems to be what I need

Just wondering if its just a question of pulling off the old and slotting in the new (and does anyone know where I might source a genuine MK4 "dual" plate?)

Cheers

Yep, the simplest thing in the world to do.

Have a visual inspection of that NTE ..... looks like an ideal spot for damp.

In reply to a post by farrinaf:

does anyone know where I might source a genuine MK4 "dual" plate?

Lots of them available on Ebay although you may need to purchase it bundled with a NTE 5C Mark 2 as well.

Not just ideal for, but evidently is. Looks to me like black mould on the floor below the socket. Compromised damp course perhaps?

Looks like a dark carpet and cobwebs.