We wouldonly be searching Google as you have probably already done Rob. It might not be as expensive as you would think to go to a local joiners shop on an idustrial estate and have a gate made exacty as you would like. There may even be a fencing contractor who would be willing to price.
The panels you have mentioned are imported to the uk by a company called KDM based in Ipswich. You could call them and find your nearest stockist. If you are in the Deleted, Suffolk or Hertfordshire area I would recommend Clarkes of Walsham, other than that you can try pennine fencing online who do the continental fencing mail order. Make sure you order the ironwork with the gate as they have shaped hinges specific to these gates.
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