Another query about installing BT Infinity2 and lo...

Question

History.
We occupied a new build house in 1998.  It was fitted with a BT Master Socket (Line Box) which is situated in a front corner of the Living Room.  We wanted to have the 'phone in a different corner of the room and also wanted to install some more electrical sockets and television aerial sockets, so before we moved in we set about doing that.  While we had holes in the walls and floors lifted we took the opportunity to install some telephone extension sockets.
The Telephone Installation.
Using a BT extension kit and BT junction boxes.  (and connecting all six wires of the cable into the appropriate locations)
From Line Box in Living Room to Bedroom 3, which is immediately above -  one cable within the cavity wall to a junction box under the floor of Bedroom 3.
From that junction box -  one cable to Bedroom 3 telephone wall plate and
one cable to another junction box under the landing floor.
From the landing floor junction box - one cable within the wall back down to an inner corner of the Living Room to a telephone wall plate   and 
one cable within a wall down to the Kitchen telephone wall plate and
one cable under the floor to Bedroom 1 telephone wall plate.
All extensions have worked well since then.
My Line Rental has always been with BT and except for a brief period with Talk Talk my calls have also been with BT.
We later obtained AOL Dial Up which worked fine then later AOL Broadband. When we obtained the Broadband service we fitted BT Filters to each of the extensions in use and had no problems. The AOL Router and desktop computer are in Bedroom 3 plugged into that extension. Lately, the AOL Broadband has become impossibly slow so we have ordered BT Infinity 2 which is due to be installed next week. 
Question 1.
I understand that the normal installation installs a Broadband Filter plate, which includes a Broadband socket,  in the Line Box between the BT line and the telephone plug socket.  Is it possible for the extension wall plate in Bedroom 3 to be changed to a Line Box to accomodate said Filter plate without any other work being necessary?
Question 2.
If the above is possible, can the original Line Box in the Living Room be left in situ and useable as an extension ?
Question 3.
If the two above are possible can we then remove all the Line Filters from the extension sockets or will one always be necessary in the original Line Box in the Living Room as the new Filter fitted in Bedroom 3 is "downstream" of the incoming BT line?
Question 4.
What does backwiring mean?
Solved!
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Answer 1

Well it's installed and working.
I have to admit that after reading some of the threads on this site I was rather apprehensive as to what to expect and what could or could not be  done. 
I received two email reminders/confirmations from BT about the forthcoming engineer visit.
The engineer telephoned on the morning of the appointment to confirm that he was en route and he arrived on time.
I explained my wiring set up and he advised that this was not a problem as he could install wireless.  I commented that BT advised ethernet cabling for the fastest speed.  He replied that in his experience the speed was subject to many variables and that he personally used wireless and that it was just as fast)
He fitted a replacement Master Socket (didn't just alter the already fitted one), connected up the Hub and Modem, went off to the street cabinet, returned and confirmed that my daughter's laptop was connected to the Hub, and that was it. He gave us the standard advice about the speed that we could expect and that it may vary considerably for the first few days.  I cannot recall the actual speed quoted but do know that it was many times faster than we had been forced to endure from our previous provider.    BT call centre had advised us that the engineer would be able to supply a wireless adapter to replace the one I was using in my laptop, but that was wrong information as he advised us that in his experience this had never been the case.
After he had left we simply deinstalled the Netgear from my laptop and re-connected the Netgear adapter I already had to the Hub and that was my laptop connected.
We bought another Netgear Wireless Adapter for the Desktop and installed & connected that to the Hub.
My wife and daughter both have Kindle Fire devices which happily talk to the Hub by Wi-Fi  and my daughter's Smartphone also talks to it, so everyone is happy. 
The only problem that we encountered was when I switched off the power to the Hub and Modem whilst tidying up the cabling. When I powered up again we had lost Broadband and the Lan1 light on the Modem was not lit. The troubleshooting guidance advised re-starting the Hub, but that didn't solve the problem.  Our instructions advised that if this occurred on the day of installation that we should wait until after midnight on that day to ascertain whether Broadband had re-connected.
The following morning I re-read the troubleshooting guide in the brochure and tried re-starting the Hub but it still made no difference. We called the helpline number who advised us to press the "re-set" button on the Modem for 20 seconds then the re-start button on the Hub for 10 seconds.  (The troubleshooting guide made no mention of re-setting the Modem. )    That worked.
We've had one slight problem since then when I tried mounting the Modem on the wall instead of it lying on the carpeted floor and moved the Hub to the end of the window sill behind the curtain. Shortly after that we lost the wirless connection although all the relevant lights on the Modem and Hub were lit.    The connection returned when I moved them back to where they had been previously. I'm still trying to figure that one out.