Hotel Voyeur isn't a company, neither is Angels TV. They are just names for the output ie. the programming that goes out on the channel.
Sometimes channels take their name from the name of the licence holding company and sometimes from the name of the programmes they transmit.
The licence holder for what was Hotel Voyeur is a company called Over 18 TV. This same company now transmits a programme called Angels TV. All claims that Angels TV is a separate and distinct operation are bogus.
There may well be other companies in the wings but essentially the company responsible for this appalling mess is Over 18 TV.
I agree though that it will be more difficult for the girls to get their money as they weren't permanent staff, and also as with most, if not all, of these channels no letters of engagement or contracts are used. It's a very casual arrangement.
Nevertheless, the girls are self employed contractors for the channels and as such they certainly do have a case. They've agreed a rate, provided their services, invoiced for them and then not been paid.
Their next step should be to make an appointment at their local Citizens Advice Bureau for some free legal advice.
http://www.citizensadvice.org.uk/
I would also suggest to any model working on these channels to get as much as you can in writing regarding your employment. The channels don't like contracts but even if you got something from the person who hired you in email form, stating the agreed rate, the channel name and anticipated number of shifts per month, that would help.
Also, each time you're booked make sure it's confirmed by email and not just by a phone call. That way, if you ever have problems getting your money at least you'll have something in writing to help you present your case.
If no emails are forthcoming you can still help matters by being proactive, so you email the company confirming the arrangements.
When you're hired initially:
Dear Mr Con Artist
Many thanks for engaging me as presenter on your channel 'Rip Off a Babe TV'. As agreed, my stage name is, my rate is, and the anticipated number of shifts per month is ...
Regards etc
Each time you're booked, email the person back confirming the booking - mention the date and the rate agreed for the shift. When you subsequently invoice make sure the specific date for the work is mentioned on the invoice.