Agas and Waitrose 'make you posh'
Employing a cleaner, saying "supper" instead of "dinner" and owning an Aga are among the current indicators that one is posh, according to a study.
A quarter of those questioned consider spending more than £10 on a bottle of wine to be posh, the poll by Opinium Research.
Other markers include telling others what school you went to while in your 30s, doing the weekly shop at Waitrose and drinking Earl Grey tea.
Almost two in three people (63%) would not want to be considered posh but just 11% said they would not marry a posh person.
Just over a third of Britons (36%) consider themselves working class and 31% describe themselves as middle class, while just 5% do not believe social classes exist.
The main factors in determining social class are regarded as upbringing (49%), income (47%), owning more than one house (45%), education (44%), job (39%) and family money (21%).
But is it also the "little things" that mark someone out as posh, said Opinium.
Going to the opera or ballet was singled out by 37% of people, as was having a cleaner (35%) and wearing clothing brands such as Hackett or Barbour (33%).
Others indicators included an interest in horses or sailing (32%) and greeting others with a kiss on both cheeks (17%). Also making the list were drinking Earl Grey or other specialist teas (14%), knowing what Prosecco is (13%) and eating houmous (4%).
Opinium Research managing director James Endersby said: "What people consider to be posh seems to be really wide-ranging. Most people look to a person's education but will also judge people on little things like where they shop and what type of tea they drink."