Paid 'the Oxbridge Research Group' for editing of a personal statement. They said they'd send a questionnaire but didn't. I read (largely adverse) coverage of them online, and decided not to use them, and asked for a refund. They said they don't issue refunds (!) When I emailed to say they should consider the consequences of getting more negative feedback online given their already unfavourable reputation, they threatened legal action. I would recommend avoiding them.