"extended choice" is correct and usable in written English.
You can use it when you want to refer to a broad range of choices or options available. For example, "The store offered an extended choice of household items to choose from."
The reason I was sitting in a school hall listening to a headteacher make her case to look after my daughter for five years was that the government has extended choice to state education.
The extended choice network will also mean patients can choose any independent provider offering the operation at the same price as the NHS tariff.
Most studies have estimated transport mode choice models with an extended choice set using attributes such as average travel time and costs.
Provided that all safety requirements are met, gluten-containing raw materials treated in an adequate way to remove CD-active gluten fragments may be used together with naturally gluten-free ingredients to create an extended choice of high-quality gluten-free products.
The extended choice of options of wild crested macaque females when responding to aggression (avoiding, ignoring, and affiliating) may constitute alternative tactics to retaliation and may better balance conflicts of interest.
Labour also supports the use of private firms in the NHS to extend choice.
Department of Health responds: "We see a strong role for the Commissioning Board, particularly in … extending choice for pregnant women.
Yesterday, Mr Lansley insisted that extending choice would give patients more control over their care and better results.
Ministers talk constantly about extending choice, adapting services to individual needs and money following patients and pupils.
4.00pm GMT Mike Freer, a Conservative, says gay marriage is in the best Conservative tradition of extending choice while preserving religious freedom.
And while extending choice, we will give professionals the freedom to treat patients and run hospitals as they - not bureaucrats - see fit.
