Hi Bill.
Apparently there is no limit to the amount of money you can take to Turkey although there is on the amount of lira you can take out, BUT, according to Direct Gov if the amount exceeds 10,000euros or the equivalent in any other currency, you need to declare it before departure using a downloadable form (C9011) or at the UK airport. Failure to declare carries a max £5000 penalty.
Hope this helps and have a great holiday!!
Steve