re: Money transfer limit
Easiest way is to open up a dollar account at one the Pakistani banks. Quite a few of them have offices in UK and US and we could walk in and open new account. I think UBL offers online as well.
Once account is open, deposit your large check and do business in Pakistan without hassles.
Even thou in the US banks do notify the government for any transacation that is over 10K per day, you don't have to do anything, this is something bank is required by law and should not worry too much if you are in the US. UK might be a very different story.
Regards,