Hi Gimpymoo,
The Honda branded paniers & top box on my 2009 GT (Mk1) are definitely rebranded Givi products. The "Ropey" lid restraints were pathetic and didn't last very long. After doing some google research I found some genuine Givi spares that were made of a dense flexible, nylon (?) type of material that are still in use, more than ten years on, I think.
I bought them, on line, from a UK company called Bike Bitz BUT, they appear to have ceased trading !! Being geniune Givi spares I would think they could be still available somewhere, the boxes were a very common item. The same part number suited both top box & panniers.
I haven't found the original receipt or part number references yet but I will keep looking.
Good luck anyway,
Cheers
Paul