It depends whether the source and destination are on RAMAN doesn't it? If both are then it's a simple booking and you don't need to know the routing - just that it will happen.
that's because there's someone in CCA who makes it happen
It's the legacy, non-RAMAN, circuits that are still point-to-point and require intermediate locations to be in the chain in some cases.
Microwave links are still in use, even for HD programmes. There is certainly HD digital microwave kit at Crystal Palace (which allows a higher bit rate, and lower delay than satellite) - or kit has been rigged in the past.
Most of the News microwave circuits are still analogue and PAL though - and sometimes looking a bit miserable these days...
There are still a fair number of non-RAMAN circuits in use - for example, Brighton can work into either Tunbridge Wells or Southampton (via Rowridge.). Looking at this diagram, it appears that the biggest chain in the contribution network is Preston Guild Hall to Cardiff, via 7 transmitter sites, though I'm not sure I've ever seen it used.
Some of the more far-flung parts of the network are having IP circuits installed, and this seems to be the case for new offices, like Stornoway.
The CP receive site is no more, though. It was decommissioned, somewhat inconveniently, just a couple of weeks too early for it to be useful for a large-scale OB at St Paul's which cropped up at short notice lately.