Wow that's a lot more response than I expected, thank you, sorry for not responding sooner it's been a day for bad news. Anyway, to try and answer some of the questions, yes I'm going for the rural branch line terminus idea almost certainly set in a fictional location somewhere in Yorkshire for the simple reason it's where I live so being able to visit heritage lines for a look around will hopefully bring idea's. It's that reasoning that led to either LNER or LMS and since I know someone doing the LMS it only seemed right to bring in the competition.
To give an idea of just how small everything will be my baseboard is is one from scale model scenery and is just 1100mm x 225mm which just fits nicely on the shelf I have, I plan to add a small fiddle yard that detaches so the entire main board can be scenic. I've gone to n-gauge so I can get more in but it still leaves me tight on space, I might start a thread on the building as I've been very much enjoying it so far as that's going off topic.
Since I'm doing N I'm expecting to either have to wait until a release or try building from a kit unless I make a lucky find somewhere, since I'm a novice at this knowing what to look for is half the battle as there seems to be less resources on the LNER than such at the GWR which seemed to have a book on every shelf at the last show I visited.