One factor might be that the London bus drivers are still handling cash or we're until very recently.
I think Dublin bus stopped accepting cash weeks ago.Any of the buses I've seen have social distancing measures so that only one person can be seated every three rows.They're almost empty all the time.
Dublin bus drivers have never handled cash as far as I know ....they also have had screens for at least 20 years if me memory serves me correctly..... 8 drivers is quite alot to die .....I'm sure then from them figures you can speculate the drivers who got it must have run into the dozens if not hundreds ......kinda puts freenows comical DIY screens for taxi drivers into perspective and also the nonsense about having to get direct hits of spit and snot directly into your eye or mouth to catch it as screens are used in London too as far as I know
This thing is airbourne .......
If a bus has capacity for approx 80 passangers and this thing floats around( which I believe it does )..then within the confines of the vehicle a bus driver is breathing or is in contact with the same circulating air of a much greater ammount of people than a taxi driver ....the smaller confines volume of space of a taxi offset by the greater numbers of passengers could potentially lead to a bus driver being more susceptible to infection in theory ....
You would need to factor in also boris and his chief medical experts espousing the herd immunity stance they took before they realised that they wer looking at deaths in the hundreds of thousands if they kept that up ....
I dont think any of them bus drivers wer over 65 neither