London's longest underground interchange walk!

Hot on the heels of the video showing a 15 minute walk though the Paris Metro subways comes this one. I thought to myself London can do better - and it can!
Some will probably guess the locations but not the route that was involved.
The system was entered at the TfL boundary in the Liverpool Street main line station concourse and exited at the TfL boundary by the new Moorgate ticket hall entrance.
SEVEN different underground lines were walked past! Central, Elizabeth, Northern, Great Northern, Circle, Hammersmith & Metropolitan lines. That's five tube lines and two main line rail routes!
How did the walk come to be 23 minutes though? Well there's a route that I used which isn't very well known (I've used parts of it for a long time - since the 1980s in fact when I used to live in nearby Old Street) and the route involved no backtracking, no crossing over any of the route that had already been walked etc.
Its not meant to show that this is an 'interchange' in the truest sense. Those showing that at Paris merely entered and exited the system without even getting on a train - and that is what I've done too. I entered TfL's boundary at the Liverpool Street main line station concourse by Platform one and exited the TfL boundary at Moorgate (new Moorfields exit) thus the entire walk was entirely on TfL's property.
Some will probably think this is a Geoff or a Jago or maybe even a Jen or a Nick (or any other number of bloggers) video that should have been done and not a disabled autistic non-verbal blogger. But that's not how its worked. I did this first - not the others! But no doubt I'm certain others might want to leap on this and claim theirs as being the first or whatever! Kudos to them of course! And no acknowledgement that a disabled person had both filmed it and was the first to do so!
The video is as it is. Its raw. No edits nothing. No muzak. No dancing. No giving of prizes. No 'subscribe here' even! And best of all there's no commentary. That's because I have disabilities and its beyond my ability to do what others can do - besides I'm not even going to try for that would be cheating -- in a sense of course!
In due course the film will be presented in 70mm widescreen format with glorious technicolour and Dolby sound stereo! LOL!
Some even longer 'interchanges' or maybe extremely long London underground walks as they could alternatively be called, have been filmed since this one - however the issue then is some of these have extremely long walking tunnels that aren't really interesting and it means the longer the walks get (and the videos themselves too) the interest becomes somewhat less. In other words there's a risk these long underground walking stints could become boring. In high-speed mode (that is anything more than 4x, 6x even 8x speed) they look absolutely fine but at normal UA-cam speeds it does become a little tedious.
In retrospect I have decided this is the only one which will be available at normal video speed and that is because it has a lot of interest en route. New ones that are shown on this channel will be high speed versions as the interest is still going to be quite high - compared to a slow plod through long passageways with very little of interest (like those at Bank-Monument).