Julia,
Not sure if you are already aware of the new Visa requirements for visiting Turkey from 11th April 2014?
According to the Gov.uk site, if you are visiting Turkey after 11th April 2014 you need to get an e-visa in advance (online). From 11th April, the Turkish authorities will start to phase out issuing visas on arrival (at present you just pay £10 upon entry to Turkey).
Just thought it may be beneficial to let other Just You travellers know about it before they travel.
I'd advise anyone buying a visa electronically to make sure they use an authorised site, there are some sites out there that are quite happy to rip people off by charging more. There's a link on the Gov.uk site which looks ok to me, or perhaps Just You may offer to get it for you?
Thanks
Caroline