Contempt for UK law
The "only webform" comment stuck out. There is a legal requirement for displaying:
Registered information: For a UK registered business, the website needs to display the Company Information i.e. the business name, place of registration, registered number, registered office address and if it is a member of a trade association. For sole traders and partnerships, the address of the principle place of business must be displayed. - See more at: http://www.ukwda.org/blog/is-your-website-legal#sthash.nsW49qgm.dpuf
Which is why the website while portraying itself as a UK enterprise using Home Office logos etc very carefully does not identify itself as a UK or any other registered organisation. The domain registration is hidden by a privacy front. Even the name of the organisation is unclear. There is no Gamma Group UK registration. There are two Gamma International companies at disparate registered addresses that may be behind this or not. But if you don't know who it is - its hard to lodge enforcement action.
These people clearly have something to hide. They are ducking and weaving around the law put in place to protect us. Unsurprising if they are just hackers and phishers to the gentry.