Do you capitalize architect in a sentence?

The previous reply was:

No, it is not a proper noun. It just describes someone's job, like teacher, postwoman, firefighter, dustman.

--------------The above answer is wrong if you are in the UK and just someone's opinion

Architect is a protected title by the act of Parliament. Anyone can call themselves teacher, postwoman or firefighter but they will be prosecuted by law if their name is not included in registrar of Architects