Don't be fooled by any of the positive reviews. Like pointed out elsewhere these are probably encouraged or made by the agents themselves and are not a good reflection on C P Papas.
Let me put it bluntly - this is a run down office near Archway with 3 or 4 overweight, lazy, unskilled and somewhat thick agents that sit all day (smoking) waiting for phone calls. They are friendly, which is why I am not rating them as "terrible" but as "poor" instead, but they are running a "business" that is interested in getting the cheapest workers to do the job without any interest in quality or speedy resolve. If a problem occurs they simply call one of their guys, probably some cash in hand scheme (greek-style) and this guy will "fix" the problem by patching it up somehow, at some point in his own time. They are dodgy, they will not make an effort and simple requests completely overwhelm them. "Soon" without any specific schedule or "there is still a chance that our guy can do it" are answers you should get used to.
Avoid like the plague!