Visas: Visas are required for many visitors, when obtaining visas  at the border or airport, seek out the separate visa sales desk before getting in the line for passport control. UK passport holders need a visa, obtainable in advance at a Turkish consulate, or at the border with no trouble, for 10 UK pound note (from Bank of England, not a Scottish bank) to pay for visa.

For UK passport holders, the visa is valid for 3 months, so if you're planning regular vists to Turkey you won't necessarily need to pay each visit