Annex for Outwell Amber 300SA

We have recently become the owners of an Amber 300SA awning and from our first use of it we believe that an annex would be a great asset.

However, I cannot establish if one has ever been manufactured and was wondering if anyone else had managed to find a suitable unit?

I tried calling one of the Outwell agents and to be honest that didn't help much.

Any help would be appreciated.

Thanks