Ive done a little more digging and popped the router into all of the extensions in the house. The downstream stats are:

Hallway - 7392/15/5.9
Kids Bedroom - 7488/15/5.9
My Bedroom - 2528/34/6.5

So the loft and my bedroom sockets seem to give the poorest connection speed although I am sure that the loft cable comes from the Kids Bedroom socket.

Any ideas?

Something is going wrong in My Bedroom (2528 sync). Pictures of that socket.

If your bedroom and loft extensions were added at a later date it's possible they were done using an extension kit from one of the DIY sheds. Sometimes the cable supplied in these is not the best quality i.e. low grade copper and insufficient or no twists on the pairs. Another common problem with self installed extensions is that people use inappropriate tools like a screwdriver to push the cables into the connectors, which separate the jaws of the connection, resulting in a poor contact.

As a start I'd be inclined to remake all the extension connections at each of the sockets. Get a krone punchdown tool like this: http://www.amazon.co.uk/KRONE-Type-Punch-Telephone-I... Then carefully pull the cables from the punchdown connections, trim them back slightly then remake the connection, using the tool to push them into the connector firmly.

Be sure to take good photos or make good notes about which colour is attached where before starting

Here:

https://picasaweb.google.com/lh/photo/h8emk_QDgRDRzR...

My bedroom socket. I had thought it was two cables but it seems like it's only one. Having no idea how the sockets are wired together I'd take a stab at this arrangment:

Master -- Hallway (2 cables) -- Kids Bedroom (3 cables) -- My Bedroom (1 cable)

The loft must be connected to the kids bedroom socket I suppose - hence the three cables?

Thanks guys for all your help.

GeeTee - All of the sockets are original build (12 years old house) aside from the loft which was added 4 years ago.

I'm curious now as to whether the connections in the kids bedroom socket are not as tight as they might be.

At a guess the speed in your bedroom will be low too.

With a high degree of certainly, I will say that the problem lies in the kids bedroom - an IDC is only designed to take two wires not three. The extra wire will have spread the contacts too far and a wire is not in full contact.

Take all three out, and replace with the feed and one extension and see what happens.

If that solves it, you need some three way crimps, two extension and and flying lead, then connect the flying lead and feed to the IDC.

Okay. Thanks to everyone, problem is solved.

Having identified (with all your help) that something was amiss between the kids room and my own I pulled one of the cables out of the socket in the kids room out as it looked old and loose anyhow. To my surprise it had about 500mm of cable attached to it and then it came free so it wasn't attached to another socket!

I made the two remaining cables snug and was now wondering where the hell the loft socket was attached.

I had a glance in the loft cavities which run alongside my loft room and the cable dissapeared under the loft boarding. I figured that the cable must run along to the kids room so I started moving towards that area in the cavity. Jackpot.

It was so horrible that I cannot post a picture. In order to get a signal to the loft socket the cowboys who put the loft in spliced the cable from the kids room to my room and added the loft socket to that spliced cable by twisting the cables. At some stage they must have came loose.

I twisted them again and the sync in the loft is now 7616/15/8.2 so I am very happy.

Now I just need to figure out what to do with the spliced cable. It runs along the floor and it doesn't have enough give in it to tack it along the loft joists. THat means if the missus is moving boxes in the loft she runs the risk of pulling it loose again sometime.

Any suggestions? I have surpassed myself in getting this far as I am shocking with DIY. Extending a cable or the kit needed to do so is beyond me. I need to add about 4 or 5 metres to the cable length to get it along the roof and out of harm's way.

Use an IDC socket to make the joint ...

On top of the 3 in 1 termination, I see that all the IDC's would appear to have been poorly terminated. I'd splash out on a decent Kroning tool and reterminate them all.

For your next trick you can sort out the UK's economic problems.