Couldn't they use the DIRAC or something similar. I don't think a 1.45 Gbps line is necessary. After all they used the DIRAC to send HD feeds from the Beijing back to London and is used for outside broadcasts.
Dirac is in widespread use already. But you wouldn't put a permanent Dirac code/decode in the main network distribution chain. You'd have to switch to an ITV-style system (moving away from network opt-outs and to playout-switching you to line), and just Dirac encode the studio output - and if you are doing that you could use JPEG2000 or any codec. AIUI the BBC are about to switch from Raman provisioned SDI and HD-SDI circuits to BT provisioned circuits - so this may be a moot point anyway.
Which are really two different things.
Usually a newsroom is split into two main parts: intake and production/output. Intake is newsgathering - getting the stories and footage. Production is taking those stories and making packages and bulletins out of it
Must be one of the difference between the U.K. and the USA. Usually reporters in the field edit using NLE systems either on the laptop or a desktop in the truck while they're there when they will go live on location. They can produce (may not be the right word but I used it initially as they take different parts of video, voice overs and graphics) or edit a package out in the field. With cellular hotspots they can connect to the news system and with some graphics engines (or they have a templates available) from the field.
Are you talking about regional or national reporters. If national - that's not the case in the UK. If you are editing a network package in the field chances are you are working with a shoot/edit (which is a camera operator who can also picture edit)
For regional reports I think 'track and rushes' working still happens (where a reporter will file pictures and voice over back to base to be edited in the newsroom edits) - but obviously laptop editing is an option, and some reporters have basic editing skills. (One option is to file a rough cut back to base to be polished)
I saw a demo by a station group when their graphics were updating showing how to insert graphics from the field using the Viz engines back at the station. The editing software (I think it was Adobe Premiere Pro CC and Final Cut Pro) has a Viz plugin where they can access all the templates and insert data. They preview the templates, click render and a ZIP file is delivered to them. They then open dozens of images and insert them into the timeline. The finished product could be sent/fed to the station via microwave, satellite or what ever means that their going live and is played out from there after the reporter introduces and tags out the package. In short circumstances it's played out from the camera or from the truck.
[b]Edit[/]: Here's a similar setup demo from the VizRT website
Yep - Viz will sell you lots of nice and shiny tech. Your eyes will water when you see the cost...