Thanks, and for such helpful support from you JohnD, Dazlight and others.
I understand the diagonal proposal and yes, it probably looks quite a Wow feature when done properly, but probably needs careful alignment between rooms and setting out.
I can take a joke and banter with the best, but sometimes on forums there are quite unhelpful and blunt retorts almost, can be quite off-putting for the DIY amateur asking what to others might seem no issue.
I just remember reading "everything is obvious to the man who knows", and on this flooring subject, I don't know, but am now wiser, thanks.
I have already adopted the 'storyboard' approach that I read elsewhere {great} of clicking together a room width of offcuts or planks to establish exactly how it will go together, where to start and how to handle certain more difficult areas.
I have gone for plan B, got the wife on it for a final executive decision! The small room #1 is almost done, it didn't take long to dismantle and turn around the part already done by 90 degrees. Looks good and the narrow doorway bit is in alternate full board and then 2 short pieces witha joint midway - result!
Thanks again to all of you for all your help