With regards to why a daily late night chat show wouldn't work in the UK compared to the USA I'm guessing some have already forgotten ITV's The Nightly Show from two years ago. Admittedly that attempt suffered from a lack of consistency, in terms of rotating hosts and features/elements which came with each host.
Going back to the topic of Bradley Walsh's new show I've not yet had chance to watch it to be able to really comment on it. It sounds like the format needs some rethinking if it comes back as a full series to flow well and showcase Bradley's many talents.
"Listen, we've all got something to bring to this conversation, but from now on what I think you should bring is silence." - Rimmer