Train Simulator 2015 and 2016 editions for £5 each. If you missed out on any of the routes by not buying and upgrading to one or both, that is alot of content for less than £10 if you factor in the 20% code Greenman offer up aswell.
Plus if you buy TS2015, you get one of the routes that is needed for the Nessland Charity route
For disclosure, I am affiliated with a third party developer however, I do not know anything about any future releases unless I'm working on them and even then, I'd be breaking years worth of built up trust to say anything about it