[Brit]

Second photo down:
https://www.bbc.co.uk/news/in-pictures-40555454
I am guessing pre-World War One?

"1914 Royal Enfield Bicycle Ambulance WW1".
https://onlinebicyclemuseum.co.uk/ww...cle-ambulance/

2013:
https://news.wfsu.org/2013-08-13/in-...est-ambulances