I reckon you’d need to hit at least 50% of these to be classed as Middle Class:

1) House has 4 or more bedrooms
2) Own a car less than 3 years old
3) Own a car more than 25 years old
4) Hire a nanny
5) Annual skiing holidays
6) Have an investment portfolio
7) Own a holiday property (exc. a caravan in Skegness)
8) Send kids to a fee-paying school
9) Annual family National Trust membership
10) Shop exclusively at Waitrose and M&S

Any additions?