As someone who has experience in distressed businesses and insolvency I have to say that you guys are not helping your own cause by bombarding this forum with such messages.
To believe that a person that has so far had impeccable attitude and has run multiple trips succesfully is just sitting on your money for the fun of it and everything is there in tact is a bit wishful thinking. There is a a significant possibility that part or all the money required is no longer there otherwise you would have already received it, the reason why this situation has occured is in fact not important.
With that in mind your interest is that wetpixel continues to get cash in because otherwise there will be less resource to pay back the creditors.
Some people here are suggesting to go and tell people to stop advertising for example this is only going to accelerate a potential wind down of the business.
As I have already said get together and instruct a specialist in UK to see what next steps are possible bearing in mind you may only get partially the money you paid.
Even if, and I do not wish for one minute this was the case, Adam was physically or mentally incapacitated this does not make a difference at all to the process you need to follow which is one of bad debt recovery. Getting angry and upset is human but does not lead to any conclusion.