Garry Whiting asked me to take a few snaps of his latest find and post them on the forum...
(https://farm6.staticflickr.com/5754/22844552667_bee226e8c0_z.jpg)
(https://farm6.staticflickr.com/5680/23212567456_39503abea7_z.jpg)
(https://farm1.staticflickr.com/599/22611601513_c1e5532c83_z.jpg)
(https://farm6.staticflickr.com/5645/22942880260_103463f18e_z.jpg)
(https://farm1.staticflickr.com/706/22611604973_7c5eeab84b_z.jpg)
Garry told me that they are from someone called Jellylab on shapeways and are the sort of thing that the GVT would have used had it been in France (or bought French locos). They run on a Kato 4 wheel tram chassis.
(Thanks to Dave Lowe for the use of Porthladd Fechan as a photographic backdrop)