@DirtyteaCup
"Not necessarily. There are loads of airports that you can do a back to back at if traveling with hand luggage only. You need to ensure that the arriving plane is always the leaving plane- so not London City for example."
That's not the point I'm making.
I'm entirely aware/agree that if timings are tight between your arrival and subsequent departure you can improve your chances by being HBO.
The point I am making is how do you stand in terms of compensation/rebooking/even provision of accommodation if you fail to make the second flight, for example if your shorthaul flight UK>EU is delayed by several hours for whatever reason?
Connected booking -> same booking Reference for the two flights - the carrier should facilitate rebooking/accommodation if he delay means a nightstop at the intermediate airport. These days that process it's sometimes not as seamless as it should be but the traveller has protection.
Non connected booking ->if the passenger doesn't make the second flight it's tough..no obligation for either carrier to do or provide anything.
I've seen tears over this over the years at e.g. Gatwick - people would book a LoCo to Gatwick, and have booked onwards with Virgin, BA or one of the other Long Haul operators. LoCo late in? zero obligation for the LoCo
or the Long Haul operator to fix it...sometimes it literaly ended in tears.
I understand why people book in that way but they need to be aware of the risks and as a PP said maybe time flights accordingly.