An excellent British layout
I have had a chance to check out your route further and believe it is an excellent route with lots of operating potential for running passenger and goods trains. The track and yards are extremely well layed out with no abrupt turnouts so you must have spent a long time doing the track. The scenery and station areas are also well done. My only slight criticism would be the use of multiple distant semaphore signals between the home signals. To operate a block system you would normally have one yellow signal followed by two, sometimes three, red signals set up as a distant, home, starter approaching junctions and around stations (and possibly advanced starter after a junction, crossover or at stations). The three signals could also be used to add extra blocks when the distances between junctions required more signalling for allowing more trains on the route. A combined signal would have been used where there was insufficient distance between a separate starter and the next distant signal at the start of the next block. This is probably a much simplified description of what happens proptotypically but I have found it works well in Trainz.
I would recommend anybody who wants a smallish (it is about 70 boards end to end so not that small) British layout to try this for themselves.