A second simple YES

Yes even the old BT ADSL 1.0 faceplate

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There is so much misinformation on-line it is just crazy.
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Agree 100%.

Too many people comment, who haven't got a clue, or at best, only half a clue.

Sorry I can not see the point of having the bell wire connected if it's currently not needed, especially if one is unsure of the filtered faceplate's spec.

A filtered faceplate will filter the bell wire, which maybe needed at a later date.

Are you going to rip the wire out of your telephone cord, just because it goes to terminal 3 in the faceplate. (yes, most 2 wire phones still have a terminal 3 wire, even if not used).

Might put a bit of tape over the cord's terminal 3 connector connecting at the front of the plate LOL!

Just to add my five penn'eth.

The OP's pictures clearly show a 6 wire feed which has been backended from where ever, to provide an NTE and SSFP in that location.

I agree with MHC that back ending is frowned upon.

I also agree with Mr.S, I have never seen back ending cause any issues.

Leave the bell wire in situ, it has been filtered by the SSFP.

Wow - lots and lots of posts now, while I've been away!

Thanks for all the input. I did disconnect the bell wire, but (probably no surprise) sync speed hasn't changed at all. I may reconnect if I have a spare moment.

I don't reckon this was fitted by a 'proper' BT tech either - there's so much dodgy stuff in this house that I don't see why the phone would be any different.

The wire comes into the property from the pole, up to the gable end of the extension roof. There is a wire which then comes down into the wall where that socket is, but from the gable another wire goes into the eaves of the main house, up into the loft. I can't see from the ground whether the branch to the socket in the photos is a spur off the main cable or what. There is some sort of black cylindrical object (about 6 inches by 1 inch) up there too - maybe some sort of junction box?

There is never a phone connected to the pictured socket; the cordless base unit is plugged in in the kitchen. The only other occupied socket is in the lounge (Sky box).

There's no other faceplate with an ADSL socket in the house.

Sky box has a filter?

Star wiring and not uncommon for eaves boxes. Can be a problem for ADSL2+ sometimes.

The black lozenge is a cable repair housing.

Actually it doesn't have a filter - thought it didn't need one with the NTE5 faceplate.

Confused now!?!