I also tried an alternative system using a hose reel holder with the carrying handles cut off which made things a bit tidier still not as efficient as it is now with the two slide out trays and the rear mounted hose reel.
Here they are, right hand side first

and then the left

The fact that the hose reel is now on the other side isn't significant - it's just the side I put it on.
Last of all, a rear view before the hose reel was fitted:

Thanks for the suggestion of "before and after" Gis and Elaine. I shall try and do this in future.