I'll ask Rene's question more overtly. I'm 90% convinced that GamesPlayUK is not a reputable business; I believe that they are a scam that lures in designers with encouraging comments about the designers' games and then convinces the designer to pay ridiculous costs to produce a prototype. I'd be very interested if someone could refute this by showing a single success story for GamesPlayUK where they did actually get a game published by a "real" publisher, and/or a case where they told a designer his game was not good enough for their standards. In my opinion, buyer beware with this company.
-Jeff