As you might know, the owner and staff is Dutch . So it isn't a surprise, that most routes are in the Netherlands and surrounding countries, like Belgium and especially Germany.
But as you als might know, the Dutch people conquered the world and ruled the 7 seas, in our Golden Century (1585-1702). So what our ancestors did, MRA want's to do the same, but like old Rome... it wasn't build in 7 days, but also won't last a century .
I want to emphasize, what Con wrote: share your embedded routes on your website, if you have one, like I did: https://routes.lexwill.cyou/gps-routes-maken/ (yes there is a translation button somewhere on the site, so you are not obliged to learn Dutch, but feel free to).
I have plans, visiting the UK someday (if I can find time & money on the same moment that is), so I am very eager to learn from your routes, although they are not that pimped up, like our RouteXpert routes. But they are equally important.