I was Met for just short of 12 years, a Detective for 9 of those and in Specialist Crime (fraud and computer crime in particular) for 4 of those years. As such, please do take the following as gospel (or as close as you'll get here)
What needs to happen for anything at all to be investigated is for as many people as possible who have fake baggies from this lowlife (and let's face it, he's said and done nothing to prove otherwise) to report their loss to Action Fraud. No point at all in contacting the police. AF is the reporting point for all fraud matters, which this is.
Don't expect anything to happen anytime soon. The first few reports will, most likely, be ignored due to the value. Even 10 years ago individual fraud offences of less than £1,000 weren't investigated at even a local level on my Borough. Nope, not making that up. It's simply a matter of resources. In order for this to be progressed AF will need to pass it to a police force to investigate. If this gets split between forces it's dead in the water. If they are able to link the allegations then the whole lot will be passed to (I think this would still be the case) Glanville's local force to deal with.
IF enough half decent evidence AND value of loss is presented at the point it's passed to the local force it will, most likely, be investigated. It will be some poor DC with a load of other weary crimes on his screen to investigate and, unless he's a SW fan, this will not please him. If neither the value of loss nor half decent evidence is presented at the point of passing to his force it will be "screened out" and written off due to resources/not in the public interest, etc.
So, to achieve maximum chance of success all those ripped off need to get organised. I suggest either a sub forum here that a certain someone doesn't have ready access to or perhaps a FB group (harder to keep the wolf in sheep's clothing out of but likely to get a wider membership). You'll need to have enough common pieces of information in order to report it. It will also enable you to share your separate crime numbers so when I he next guy reports it they can add those to the report in order to link them without problem.
Once you have decided to go ahead and report you will have one of two options: report as a collective or report as individuals. There are pros and cons to both. If doing so collectively, I suggest someone with evidence does so. Frank, mate, you would be ideal for this. You are the man who can. You have the knowledge and evidence. I would suggest you also get UKG's details and co-operation, too. This will help the poor DC have a couple of go-to guys for evidence. With a statement from each of you as well as a long, long talk to help him get his head around why a plastic figure in a plastic bag can be worth anything at all, let alone faking, they'll have enough to have a fighting chance of arresting him and putting in a half decent interview.
The physical evidence is going to be the baggie figures. This will mean giving them up, I'm afraid. You'll get them back(eventually) but they'll be slightly shiny and silver when you do! It does clean off.
TT has never been investigated because I do doubt anyone has even bothered to speak to the Police. And if they have then they've not be able to leap through the invisible hoops mentioned above. The above is not an exhaustive guide but it's a start. It'll be a long and slow process but it's worth doing. Complacency is Glanville's biggest chance of getting away scott free from this. Don't let him.