for info
it looks like the system for UK passport holders travelling to EU/Schengen countries https://www.schengenvisainfo.com/schengen-visa-countries-list/
after we leave the EU may be something along the lines of the system presently operating to travel to the likes of the US.
We will need to pay for a visa of some kind online (for the US it's the ESTA scheme) and we will then be subject to more checks at passport/immigration control. (And just because the online paperwork has been granted it does not necessarily follow that you are guaranteed entry). From personal experience of entering the US I know that questions asked by the border guards of each traveller were along the lines of: how long we were going to be in the country, where we were staying, for how long, where in the country we would be travelling, when would we be leaving etc. Similar questioning took place by Canadian border officials when travelling from the US to Canada.
Please