I don't think that Turkey is a good friendly idea. Because of the history and politics etc. it's not a good reflection of where our team is at. IE the last friendly with them we were playing not too lose and just did 5 atb so they wouldn't score at all costs. I guess an exercise for our defensive muscle but no.
I think a smarter friendly would be between a very good side ie) France, Belgium, Netherlands
or a smaller side with a more professional FA like Northern Ireland, Wales, Czech Republic
playing a rival international derby is just unnecessary stress
Northern Ireland would be good because they're a mix of english 1st and 2nd division players. Probably the best run league in the world.