A very useful tool 
The Recommended Grass and Clover List
Free to download 
https://www.britishgrassland.com/publications/recommended-grass-and-clover-list-2023-24/
The guide has been developed by grassland experts to provide information on varieties that have been trialled in the UK and to provide technical information on formulating mixes for cutting and/or grazing in wet and dry areas.

Newspaper clipping from The Farmer