John, I think you can get a doobry-wotsit (or it might be an oojama-flip) that you plug in upstairs and it beams a signal downstairs. Don't know much about it though. A good person to talk to would be Shaun Steger-Lewis (Opus Telecom) on 07840 120160 who knows everything there is to know about 'phones. I would really recommend him.
John - Not sure about this but I think you are not allowed to move the master box only connect to it in an approved way. There should be no reason for moving it as you can get a plug in wired extension that will give you all facilities including ADSL.
Of course you may not want it accessible upstairs but then again you can get something that locks the facility I believe.
It rather looks as if a combination of a wireless range extender (signal is too low in the new office) and a plug in phone line extender should do the job. Still not ideal as the original wireless router will then be in what is to become the babies bedroom but it will be a good deal less traumatic than having BT move the kit. (Probably!)
An electrician can do this for you. The connection to the first phone point is owned by BT but you are able to connect an extention wire into this box. Wired in a similar way to an electric wire to a socket. Not BT prices and not a big deal, done it lots of times.
Hi John i have just check with HO and should you want professional Communication engineer to move your telephone line point add a socket ect Utility Warehouse charges £164.51p inc vat. BT charges 171.55p inc vat. Not that much cheaper. I would be tempted to look freelance communications engineer, and cost them. Or DIY dependent on the job
OK I have a kind of fix for now thanks for the inputs.
For those who have a similar problem I used a product from devolo dlan broadband extender which takes the broadband ethernet signal and put over the mains wiring. It worked straight out the box.I got mine from Maplin cos I wanted it sorted but I think Simon from Delta PC does something similar.
The set up is not perfect I still need to move the phone signal as well but there is a similar DECT product to allow this.
I think the main problem with all of this is that BT/Openreach is still a monopoly and they really do not want to bugger about with installed lines, so they charge accordingly.
Thanks to all for the suggestions.
Hope this helps for anyone else with similar issues.