Apologies on that. There are three handsets. I have removed them one by one to isolate if it was one of them however the problem still replicates itself with a wired handset.

I have not tried a different handset as yet, however I plan too when I can grab one from my neighbour

Any other thoughts at all? Thanks for the information by-the-way.

When you say in one post

In reply to:

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There is no line filter on any socket except the extension lead which connects to the modem.

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but in another post

In reply to:

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There are filters in place - I even purchased new ones - no luck with those.

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it is unlikely that you will get very much help here. I suggest you call in BT to fix your problem.

I realise that I said that although it seems to make no difference if they are connected or not.

You are giving people (who are trying to help you) bogus information because you have decided that that particular part isn't the problem. May I remind you you are the novice and as such should follow instructions given.

You: I can't get to sheffield
Us: Are you on the correct side of the road
You: I don't see why that would matter, as I've always driven on this side and got to my destination successfully
Us: Try driving on the correct side of the road and follow signs for sheffield
You: Nope, no joy.
Us: Are you on the correct side of the road
You: Well no, but I don't see why that would matter.......

As ETEE said, you don't have to take the advice, but it is of questionable benefit if you select parts of it to ignore on a somewhat arbitrary basis.

Fair point. I must remind you that it is not deliberate on my part. I have read those documents and others, and have followed the steps recommended.

I am a novice, and yes I understand this and I have attempted the basics:
+ Add / remove line filters
+ Purchased new line filters
+ Disconnect each phone one-by-one to resolve the issue

I have also inspected the wiring as advised and to my eyes it appears as the original poster's information suggested. eg. to make certain that only two wires (2+5?) are connected for each socket - this is the case.

If you can provide photographs as per your earlier invitation I expect that would help.

Not a problem. Will get on to it.

I recently replaced my DECT phone for just that reason - played havoc with my router as far as wireless was concerned (phone was BT and router was BT!).

Got a non BT DECT phone and guess what - no problems at all since.

Of course, you could always do what you should have done to start with - contact your ISP, and log it as a fault. I've been doing a little more digging, and although the main culprits for your fault are still bad filters and/or bad internal wiring, the problem can be caused on rare occasions by a BT line fault, so you should ask your ISP for a line test.

Easier said than done with Bulldog, or pipex or whomever is managing them these days

I shall keep that in mind.