The story continues ... you may have noticed from the pictures that 'new' straight board that I built to replace the dodgy curve is aligned at an angle to the wall sticking into the railway room.  This is a result of the 'old' station boards being designed to fit in the living room of my previous house.  The main station boards were fitted in between two chimney breasts and the exit line had to be angled to avoid one of these chimney breasts. Now in the 'new' railway room has no chimney breast and is about 30cm narrower (my overall width has gone down from 11ft / 3.3m to 10ft / 3.04m) and as I'm modelling in P4 I want to change the layout to maximise the curve radius.  So I've set about cutting about the side station and throat  boards so the angled exit becomes parallel with the wall and in that way I will gain 30cm in radius for the curve that will go around the ends of the room.  Having the station throat realigned means that the station end of the boards sticks out into the room instead.  However, that is going to be 'fixed' by inserting a new board in-between the two station platform boards to make the platforms longer and with a curve to realign the end board to be parallel with the wall again - better explained in pictures:

Firstly the 'old' alignment from above:

Now having separated the station boards to cut the part nearer the throat at an angle so the track is parallel with the wall, I'm drawing the rough position of the curves in yellow.  The intermediate board will be two  to three Mk1 coach lengths so I can have nine Mk1s and loco in the platforms ...

temporarily I've joined the station boards back together sticking out at an angle until I've made the intermediate board:

Now viewed from the other end before attached the new straight board:

now with the new straight board attached as the temporary 'fiddle board':

the point of all this is I now have the boards roughly aligned for constructing the curved boards at the ends and the new intermediate station platform  board.  but meanwhile I have some working track to test run any stock I get around to building!

Keep safe everyone!