Thanks for your reply. Unfortunately I cannot find this in build 14291.1001.
Goint to Settings>>Time & Language>>Speech... there is a default language: English(united Kingdom) and under Text-to-speech there is simply the option to change the voice.
Goint to Settings>>Time & Language>>Language...there is English(united Kingdom):
Regional format: active
When hold tap on this profile there is a list 5 options:
Keyboard options (no speech related seeting inside)
Speech options (which displays speech settings as above)
In WP8.1, it was possible to dial a number via a connected BT headset : tap the button on the headset and say: "call xxx" it would then dial said contact (even if the screen was off). The same with text. Tap the button on the headset and say: "text xxx", it was then possible to compose a text message and send - all via BT headset. Also when a text was received you would be prompted to either : "read it" or "ignore".
This feature is important to me as I spend a lot of time in the car