>>13841474
>change in the sign's rules which a pending construction disruption might necessitate?
Yup. The planning doc discussed taxi ranks, for example. There is one between the RED BUS stop and Piccadilly Circus, which you can spot in the vids of Coventry Street, near TGIF and the steakhouse area, but on other side of street. There was talk of converting that into a bus stand; so they did, the sign changed, and the idea was temporarily tried. Don't know why that seemed to be abandoned later.
On Whitcomb, beside the building that would be gutted, the planning necessitated repurposes the sidewalk and the kerbsie bus stands, there were two, for scaffolding and for moving construction gear and materials. Trailers were setup on the Lecester Square side of the building. So in the background of RED BUS pic there's these two stands that would be covered with scaffold and shrouded.
https://www.google.com/maps/@51.5100852,-0.1312665,3a,75y,64.39h,99.26t/data=!3m7!1e1!3m5!1sNgqIs5oPwAnIZYu1XX1KEg!2e0!5s20140501T000000!7i13312!8i6656
That meant the bus route had to find alternative places to park the tour buses. They found space on side streets and the signs there were also changed to reflect that.
Ruperts Street
https://www.google.com/maps/@51.5106773,-0.1324081,3a,52.7y,197.99h,93.53t/data=!3m7!1e1!3m5!1slT7996dytbWky2h6qy0CAQ!2e0!5s20140501T000000!7i13312!8i6656
Oxedon was also suggested and prolly used but not heavent spotted sign changes yet. Thinking that they also had to find a new place for the motorcycle parking and Oxedon would have been good candidate. IDK
https://www.google.com/maps/@51.5097598,-0.1318053,3a,79.9y,303.72h,99.02t/data=!3m7!1e1!3m5!1sZJapMoA9oP0It-iPnzDHWQ!2e0!5s20140501T000000!7i13312!8i6656
Also there is an alley that connects with Whitcomb.
https://www.google.com/maps/@51.5100017,-0.1314752,3a,65.4y,74.24h,85.08t/data=!3m7!1e1!3m5!1sNmCTUaCaFQFFjhLUXcm7WA!2e0!5s20140501T000000!7i13312!8i6656
In addition, the tour company could have traded off the two stands for additional space near Hyde Park Corner, also a prime location for their various tour routes.
As can be seen in vids from around the time, plus 2015, the open top tours continued to use the RED BUS stop but it doubled for both hopping on and hopping off at the start/end of a particular route. This stand is where driver and tour guide might take breakes or switch at end of shifts and the like.
As always, traffic gets pretty chaotic with all the different kinds of vehicles and Coventry Street is a good example of that. Mix in the passengers with a few one-way streets and makes for some complicated use for those many uses.
There is a chance that a private hire outfit would make a call to the tour company and gain permission to use the stand with a bit of notice and scheduling. The advantage of a private hire is that you do not have to go on a big tour when the group just wants to hit a few common destinations, like, say, Piccadilly Circus, China Town, Hyde Park, and Embankment. And there might be a little more looseness in waiting for passengers to come and go at different meet-up locations. On the other hand, if you miss your ride home from, say Winter Wonderland, you might have to find an alternative means of transport late at night.
Heck, can imagine a group hiring a bright lovely double decker just to go to Piccadilly and then to Winter Wonderland, and then a 'stoaway' asking for a lift to but not from. Esp if the hire was waiting at the posh Corinthea Hotel.