Thank you @Lodge102 , I have sourced all this information from my research.
What I am really looking for is a UK airbnb host that actually uses smart locks effectively and can share their experience.
It seems we are a long way behind the curve in the UK compared to the US for example where August is a popular lock and several smart locks link directly with airbnb listings.
Not something that airbnb in the UK offer.
One of the issues is a lot of the US locks aren't appropriate for UK doors, primarily deadbolt based. There are not that many smart locks that operate with multi point lever locks that are common in the UK.
The best 3 I can identify are Loqed, Ultion Nuki and Yale Conexis L2
They all have pros and cons
I'm favouring the Nuki as you can have a blue tooth linked key pad for those that don't want to download an app for a virtual key, cards and fobs and also still retain a key option that you can put in a key safe for the 'everything else has failed belt and braces entry option'.
Do UK airbnb hosts use smart locks or is there something that i'm missing that makes it not practical?
Thanks everyone