Deep diving into the collection online doesn't hold much info, but as far as I can ascertain the collection wasn't completed, as issues 9 & 11 weren't issued, and there appears to be a fabled unreleased model that appeared on the aftermarket platforms, listed below as +1. If you have better info than I have, do get in touch by hitting the contact button at the foot of the page, and I'll share the info with the world. It's widely noted that the models are Corgi (Vanguards/Lledo) models.

With apologies for the resolution quality for some of the images on the subsequent pages, unfortunately the site I recycled them from appears not to be hosting the original quality image, and only hosting the thumbnails now. 

It does, however, allow the browser to see the model, if not at full quality. The model may still be available to buy from Ebay, Amazon, Etsy or Vinted, also check out RM toys

For those that do have high quality images, try 'right-click' then 'open image in new tab', and you will see the best resolution version.