Please can you advise a suitable breathable groundsheet for use with a Quest Windsor Plus awning. Thank you

The best option is to go for an Isabella carpet which can be cut to the same size as the awning and it is incredibly hard-wearing.

Please follow the link below to the options, the best one to go for is the 3 x 2.5m and then just cut or fold the additional amount.

https://www.attwoolls.co.uk/isabella-awning-carpet-2-5m-depth