TT1 refers to the Footprint code for Susan's Day Out. I'll change this as it isn't evident on her page. We use notes like this to indicate overlap and re-releases and re-packaging of titles. (Footprint is a firm which is no longer trading, but some of the material has been re-released in other packages.)
All of the films on her page are hard core, except for Satellite TV programmes. On the rare occasions we include a soft core film, we try to indicate the fact. If there is no R18 it means that the film was made, e.g., in the USA and has not been certificated in the UK. It does not mean that it is soft core.
Do not assume that all the films are still available. (This applies to every filmography.)
For the American films look in the US retail sites in the Links section, like jadedvideo.