Jon, as far as I know there is no 'club' functionality in CT.

However, there are a few things to try:

One is to have a common account open to everyone - but that may cause issues if people edit routes and would require all to be familiar with CT. (Not a bad thing!)

Another is to download the routes (in various formats) and share those via email/chat etc. 

I haven't tested it, but perhaps the simplest would be to open the folder in your browser, copy the URL and share that through the usual channels. So long as all the routes are 'public' then people with the link can access the files and save them to their own accounts or download them to best suit their own personal tastes (Garmin/Wahoo etc.) Of course, this requires all the members to be familiar with CT. I can see the advantage that this one link would work over time - as routes are added or edited that one link would show all. For the administrator, routes marked as private would not be seen (handy for routes that are a Work-In-Progress or as a means to ensure that only the desired routes are accessible)

While there is a possibility to download all the routes from a folder, as far as I know, we need to be in the 'map screen' with elevation showing in order to include the elevation data in the download. 

Thanks for this solution, I will try it out.

Mind you, getting a group of cyclist's to use the same approach will be like herding.... cyclists 

Thanks again 

As long as the route folder is public, you should be able to share it by just copying the URL.

Here's one of mine for example: https://cycle.travel/by/dan200/journeys?group=11966